diff --git a/src/main/java/cactusServer/entities/Player.java b/src/main/java/cactusServer/entities/Player.java
index 8db7788..4120783 100644
--- a/src/main/java/cactusServer/entities/Player.java
+++ b/src/main/java/cactusServer/entities/Player.java
@@ -17,8 +17,11 @@
 	private Quaternion3D angle;
 	private CameraState cameraState;
 	private EmoteState emoteState;
+	private long lastOperateTime = System.nanoTime();
 	@JSONHint(ignore = true)
 	public static final int UNIQUE_ID_LENGTH = 12;
+	@JSONHint(ignore = true)
+	public static final long STOP_TIME_LIMIT = (long)(30 * Math.pow(10, 9));
 
 	private Player() {
 		// JSONDecode���̌Ăяo���p
@@ -80,6 +83,11 @@
 	public EmoteState getEmoteState() {
 		return emoteState;
 	}
+	
+	@JSONHint(ignore = true)
+	public long getLastOperateTime() {
+		return lastOperateTime;
+	}
 
 	public void setInstanceID(String instanceID) {
 		this.instanceID = instanceID;
@@ -112,6 +120,11 @@
 	public void setAnimationClassToStart(EmoteState.EmoteType animationClassToStart) {
 		setEmoteState(new EmoteState(animationClassToStart));
 	}
+	
+	@JSONHint(ignore = true)
+	public void setLastOperateTime(long lastOperateTime) {
+		this.lastOperateTime = lastOperateTime;
+	}
 
 	public Player update(String characterID, Position3D position, Quaternion3D angle, CameraState cameraState,
 			EmoteState.EmoteType animationClassToStart) {
diff --git a/src/main/java/cactusServer/models/Instances.java b/src/main/java/cactusServer/models/Instances.java
index fb5ad77..32c7785 100644
--- a/src/main/java/cactusServer/models/Instances.java
+++ b/src/main/java/cactusServer/models/Instances.java
@@ -111,6 +111,13 @@
 		player.update(characterID, position, angle, cameraState, animationClassToStart);
 		return player;
 	}
+	
+	public Player updatePlayer(String playerId, String characterID, Position3D position, Quaternion3D angle,
+			CameraState cameraState, EmoteState.EmoteType animationClassToStart, long lastOperateTime) {
+		Player player = updatePlayer(playerId, characterID, position, angle, cameraState, animationClassToStart);
+		player.setLastOperateTime(lastOperateTime);
+		return player;
+	}
 
 	public Instance destroyInstance(String instanceId) {
 		return instanceMap.remove(instanceId);
@@ -118,7 +125,12 @@
 
 	public Player destroyPlayer(String playerId) {
 		Player player = playerMap.get(playerId);
+		if (player == null) {
+			return null;
+		}
 		player.destroy();
+		Instance instance = Instances.getInstance().getInstance(player.getInstanceID());
+		instance.getUniverse().displace(player.getPlaceable());
 		return playerMap.remove(playerId);
 	}
 }
diff --git a/src/main/java/cactusServer/resources/PlayersRest.java b/src/main/java/cactusServer/resources/PlayersRest.java
index 29d9cd7..0fadd0f 100644
--- a/src/main/java/cactusServer/resources/PlayersRest.java
+++ b/src/main/java/cactusServer/resources/PlayersRest.java
@@ -2,6 +2,7 @@
 
 import java.util.HashMap;
 
+import javax.ws.rs.DELETE;
 import javax.ws.rs.FormParam;
 import javax.ws.rs.GET;
 import javax.ws.rs.POST;
@@ -19,6 +20,7 @@
 import cactusServer.entities.EmoteState;
 import cactusServer.entities.Player;
 import cactusServer.models.Instances;
+import cactusServer.utils.App;
 import net.arnx.jsonic.JSON;
 
 @Path("/instances/players")
@@ -63,8 +65,17 @@
 			@FormParam("position") Position3D position, @FormParam("angle") Quaternion3D angle,
 			@FormParam("cameraState") CameraState cameraState,
 			@FormParam("animationClassToStart") EmoteState.EmoteType animationClassToStart) {
-		return JSON.encode(Instances.getInstance().updatePlayer(playerId, characterID, position, angle, cameraState,
-				animationClassToStart));
+		Player player = Instances.getInstance().updatePlayer(playerId, characterID, position, angle, cameraState,
+				animationClassToStart, System.nanoTime());
+		return JSON.encode(player);
+//		return JSON.encode(Instances.getInstance().updatePlayer(playerId, characterID, position, angle, cameraState,
+//				animationClassToStart));
 	}
-
+	
+	@Path("/{playerId}")
+	@DELETE
+	@Produces(MediaType.TEXT_PLAIN)
+	public void deletePlayer(@PathParam("playerId") String playerId) {
+		Instances.getInstance().destroyPlayer(playerId);
+	}
 }
diff --git a/src/main/java/cactusServer/utils/App.java b/src/main/java/cactusServer/utils/App.java
index 60ec9da..f02f092 100644
--- a/src/main/java/cactusServer/utils/App.java
+++ b/src/main/java/cactusServer/utils/App.java
@@ -1,5 +1,7 @@
 package cactusServer.utils;
 
+import java.util.Iterator;
+import java.util.Map;
 import java.util.Timer;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
@@ -40,14 +42,15 @@
 		Instances.getInstance();
 		Accounts.getInstance();
 		initDummy();
-		start(1);
+		start(1000);
 		System.out.println("pass");
 	}
 
 	@Override
-	public void run() {
+	public void run() {
 		//System.out.println("�^�X�N�����s");
 		CollisionManager.getCollision().collisionRun();
+		deletePlayerOfExceedTimeLimit();
 	}
 
 	public void start(int interval) {
@@ -91,4 +94,25 @@
 		// System.out.println(JSON.encode(player1Decode, true));
 		// System.out.println(JSON.encode(player2Decode, true));
 	}
+	
+	private void deletePlayerOfExceedTimeLimit() {
+		long currentTime = System.nanoTime();
+		Iterator<Map.Entry<String, Player>> it = Instances.getInstance().getPlayers().entrySet().iterator();
+		while (it.hasNext()) {
+			Map.Entry<String, Player> entry = it.next();
+			String playerId = entry.getKey();
+			Player player = entry.getValue();
+			long lastOperateTime = player.getLastOperateTime();
+			System.out.println(currentTime + ", " + (lastOperateTime + Player.STOP_TIME_LIMIT) + " // playerId: " + playerId);
+			if (currentTime > (lastOperateTime + Player.STOP_TIME_LIMIT)) {
+				System.out.println("delete started (playerId: " + playerId + ")");
+				player.destroy();
+				Instance instance = Instances.getInstance().getInstance(player.getInstanceID());
+				instance.getUniverse().displace(player.getPlaceable());
+				it.remove();
+				System.out.println("delete finished (playerId: " + playerId + ")");
+			}
+		}
+		System.out.println();
+	}
 }
\ No newline at end of file