diff --git a/src/web/js/lib/maestro_info.js b/src/web/js/lib/maestro_info.js
new file mode 100644
index 0000000..11ec986
--- /dev/null
+++ b/src/web/js/lib/maestro_info.js
@@ -0,0 +1,47 @@
+class MaestroInfo {
+
+	constructor() {
+		this.maestroID	= sessionStorage.getItem("maestroID");
+		this.maestroName = "";
+		this.accountType = 0;
+		this.playerCount = 0;
+	}
+
+	loadMaestroInfo(onSuccess, onFail) {
+		let self = this;
+
+		sendRequestServer(	//url, sendParams, onSuccess, onFail, isDebugMode);
+			"./../server/maestro/maestro_info.php",
+			"maestro_id=" + this.maestroID,
+
+			(jsonData) => {
+				self.maestroName = jsonData["name"];
+				self.accountType = jsonData["accountType"];
+				self.playerCount = jsonData["playerCount"];
+
+				onSuccess();
+			},
+
+			(errorMessage, errorCode) => {
+				onFail(errorMessage, errorCode);
+			}
+
+		);
+	}
+
+	getMaxPlayerCount() {
+		switch(this.accountType) {
+			case 1:
+			return 20;
+			case 2:
+			return 50;
+			case 3:
+			return 100;
+		}
+	}
+
+	getRegisteredPlayerCount() {
+		return this.playerCount;
+	}
+
+}
diff --git a/src/web/js/player_list_manager.js b/src/web/js/player_list_manager.js
index 8146226..694fef8 100644
--- a/src/web/js/player_list_manager.js
+++ b/src/web/js/player_list_manager.js
@@ -41,7 +41,7 @@
 	}
 
 	loadAddPlayerListPage(pageNo) {
-		self = this;
+		let self = this;
 		this.activePageNo = pageNo;
 
 		let pageIndex = pageNo - 1;
@@ -68,7 +68,7 @@
 
 
 	updateAddPlayerListPage(pageNo) {
-		self = this;
+		let self = this;
 		this.playerListPage = pageNo;
 
 		let pageIndex = pageNo - 1;
@@ -149,6 +149,8 @@
 
 
 	onClickPlayerListPage(pageNo) {
+		let self = this;
+
 		switch(pageNo) {
 			case "first":
 			this.activePageNo = 1;
@@ -178,6 +180,7 @@
 
 
 	editPlayer(inputButton) {
+		let self = this;
 		// console.log(inputButton);
 		let clickedObjectID = this.getClickedObjectID(inputButton);
 
@@ -238,6 +241,8 @@
 					let playerName = $("#search_name").val();
 					self.setupSearchPlayerList(playerName);
 				}
+
+				onChangePlayerCount();
 			},
 
 			(errorMessage, errorCode) => {
diff --git a/src/web/maestro/main_menu.html b/src/web/maestro/main_menu.html
index 709cc6e..e6ffab8 100644
--- a/src/web/maestro/main_menu.html
+++ b/src/web/maestro/main_menu.html
@@ -12,6 +12,7 @@
 	<script type="text/javascript" src="./../../../resources/jquery/jquery-3.3.1.min.js"></script>
 	<script type="text/javascript" src="./../js/main.js"></script>
 	<script type="text/javascript" src="./../js/lib/account_validator.js"></script>
+	<script type="text/javascript" src="./../js/lib/maestro_info.js"></script>
 	<script type="text/javascript" src="./../js/request_server.js"></script>
 	<script type="text/javascript" src="./../js/maestro_main.js"></script>
 	<script type="text/javascript" src="./../js/player_list.js"></script>
diff --git a/src/web/module/maestro_section_add_player.html b/src/web/module/maestro_section_add_player.html
index 24b6018..c94de20 100644
--- a/src/web/module/maestro_section_add_player.html
+++ b/src/web/module/maestro_section_add_player.html
@@ -15,17 +15,6 @@ function addPlayer() {
 	let playerName = $("#add_player_name").val();
 	let enterCode = $("#add_player_enter_code").val();
 
-	if(!accountValidator.isValidPlayerID(playerName)) {
-		console.log("Error - playerName : " + playerName);
-		onErrorPlayerID(accountValidator.messageForInvalidPlayerID(playerName));
-		return;
-	} else if(!accountValidator.isValidPlayerPW(enterCode)) {
-		console.log("Error - enterCode : " + enterCode);
-		onErrorPlayerPW(accountValidator.messageForInvalidPlayerPW(enterCode));
-		return;
-	}
-
-	/*
 	if(playerName.length === 0) {
 		// $("#add_player_notice").val("학생 이름을 입력하세요.");
 		$("#error_message").text("학생 이름을 입력하세요.");
@@ -37,7 +26,22 @@ function addPlayer() {
 		$("#add_player_enter_code").focus();
 		return;
 	}
-	*/
+
+
+	if(maestroInfo.getRegisteredPlayerCount() >= maestroInfo.getMaxPlayerCount()) {
+		$("#error_message").text("학생을 더 이상 추가할 수 없습니다. (더 많은 학생수로 업그레이드 하세요)");
+		return;
+	}
+
+	if(!accountValidator.isValidPlayerID(playerName)) {
+		console.log("Error - playerName : " + playerName);
+		onErrorPlayerID(accountValidator.messageForInvalidPlayerID(playerName));
+		return;
+	} else if(!accountValidator.isValidPlayerPW(enterCode)) {
+		console.log("Error - enterCode : " + enterCode);
+		onErrorPlayerPW(accountValidator.messageForInvalidPlayerPW(enterCode));
+		return;
+	}
 
 	sendRequestServer(	//url, sendParams, onSuccess, onFail, isDebugMode);
 		"./../server/player/add_player.php",
@@ -45,6 +49,8 @@ function addPlayer() {
 
 		(jsonData) => {
 			addPlayerListManager.updateAddPlayerListPage(1);
+
+			onChangePlayerCount();
 		},
 
 		(errorMessage, errorCode) => {
diff --git a/src/web/module/maestro_section_main.html b/src/web/module/maestro_section_main.html
index f34fc4b..224f11e 100644
--- a/src/web/module/maestro_section_main.html
+++ b/src/web/module/maestro_section_main.html
@@ -1,17 +1,47 @@
 <script type="text/javascript">
 
+let maestroInfo = new MaestroInfo();
+
+
 $(document).ready(function() {
 	$("#section_add_player").load("./../module/maestro_section_add_player.html");
 	$("#search_player").load("./../module/maestro_section_search.html");
 	$("#mouse_app_list").load("./../module/maestro_section_mouse_app.html");
 	$("#typing_app_list").load("./../module/maestro_section_typing_app.html");
+
+	maestroInfo.loadMaestroInfo(onLoadSuccessMaestroInfo, onLoadFailMaestroInfo);
 });
 
+function onLoadSuccessMaestroInfo() {
+	$("#maestro_info_id").text(maestroInfo.maestroName + "님, 환영합니다.");
+	$("#maestro_info_player_count").text("학생수 : " + maestroInfo.getRegisteredPlayerCount() + " / " + maestroInfo.getMaxPlayerCount());
+}
+
+function onLoadFailMaestroInfo(errorMessage, errorCode) {
+	console.log("errorMessage : " + errorMessage);
+	console.log("errorCode : " + errorCode);
+}
+
+function onChangePlayerCount() {
+	maestroInfo.loadMaestroInfo(onLoadSuccessMaestroInfo, onLoadFailMaestroInfo);
+}
+
+
 </script>
 
 
 
 <div class="container">
+	<div id="maestro_info">
+		<span id="maestro_info_id">마에스트로 계정 이름
+		</span>
+		<span id="maestro_info_player_count">학생수 ? / ?
+		</span>
+		<span id="maestro_info_upgrade">업그레이드 버튼
+		</span>
+	</div>
+
+
 	<div id="page-tabs">
 		<ul>
 			<li class="widthQuarter activated" onClick="tabClicked(1)">학생 목록</li>
diff --git a/src/web/server/lib/maestro_account_type.php b/src/web/server/lib/maestro_account_type.php
new file mode 100644
index 0000000..6e6d2c9
--- /dev/null
+++ b/src/web/server/lib/maestro_account_type.php
@@ -0,0 +1,16 @@
+<?php
+
+function get_max_player_count($accountType) {
+	switch($accountType) {
+		case 1:
+		return 20;
+		case 2:
+		return 50;
+		case 3:
+		return 100;
+	}
+
+	return 0;
+}
+
+?>
\ No newline at end of file
diff --git a/src/web/server/maestro/maestro_info.php b/src/web/server/maestro/maestro_info.php
new file mode 100644
index 0000000..3507ddf
--- /dev/null
+++ b/src/web/server/maestro/maestro_info.php
@@ -0,0 +1,47 @@
+<?php
+header("Content-Type: application/json");
+
+include "./../lib/send_reply_json.php";
+include "./../setup/connect_db.php";
+
+$maestroID = $_POST["maestro_id"];
+
+
+$info = get_maestro_info($maestroID);
+if($info === null) {
+	set_error_message("마에스트로 계정 정보를 가져올 수 없습니다.");
+	send_result_fail();
+	exit;
+}
+
+set_data("name", $info["name"]);
+set_data("accountType", $info["accountType"]);
+set_data("playerCount", $info["playerCount"]);
+send_result_success();
+exit;
+
+
+function get_maestro_info($maestroID) {
+	global $db_conn;
+
+	$query = "
+		SELECT Name, AccountType, PlayerCount
+		FROM moty_maestro
+		WHERE MaestroID = ?
+	";
+	$stmt = $db_conn->prepare($query);
+	$stmt->bind_param("s", $maestroID);
+	$stmt->execute();
+	$stmt->bind_result($name, $accountType, $playerCount);
+	// while($stmt->fetch())
+	$stmt->fetch();
+	$stmt->close();
+
+	$info["name"] = $name;
+	$info["accountType"] = $accountType;
+	$info["playerCount"] = $playerCount;
+
+	return $info;
+}
+
+?>
\ No newline at end of file
diff --git a/src/web/server/player/add_player.php b/src/web/server/player/add_player.php
index 1149f31..299a647 100644
--- a/src/web/server/player/add_player.php
+++ b/src/web/server/player/add_player.php
@@ -2,6 +2,7 @@
 header("Content-Type: application/json");
 
 include "./../lib/send_reply_json.php";
+include "./../lib/maestro_account_type.php";
 include "./../setup/connect_db.php";
 
 $maestroID = $_POST["maestro_id"];
@@ -27,7 +28,7 @@ if($result !== null) {
 
 $maestroAccountType = get_maestro_account_type($maestroID);
 $playerCount = get_player_count($maestroID);
-if($playerCount >= $maestroAccountType * 10) {
+if($playerCount >= get_max_player_count($maestroAccountType)) {
 	set_error_message("학생을 더 이상 추가할 수 없습니다. (더 많은 학생수로 업그레이드 하세요)");
 	send_result_fail();
 	exit;