diff --git a/src/main/java/cactusServer/entities/Instance.java b/src/main/java/cactusServer/entities/Instance.java
index a3a2b2c..68b3b5d 100644
--- a/src/main/java/cactusServer/entities/Instance.java
+++ b/src/main/java/cactusServer/entities/Instance.java
@@ -50,7 +50,7 @@
 		setName(name);
 		setState(state);
 		setStage(stageURI);
-		initUniverse();
+		//initUniverse();
 	}
 
 	private void initUniverse() {
diff --git a/src/main/java/cactusServer/models/Instances.java b/src/main/java/cactusServer/models/Instances.java
index 3607ed9..befbc3b 100644
--- a/src/main/java/cactusServer/models/Instances.java
+++ b/src/main/java/cactusServer/models/Instances.java
@@ -77,9 +77,32 @@
 		return instanceMap.get(instanceId);
 	}
 
+	/**
+	 * �Splayer��Ԃ�
+	 * @return
+	 */
 	public List<Player> getPlayers() {
 		return new ArrayList<Player>(playerMap.values());
 	}
+	
+	/**
+	 * ID�ɑΉ�����instance�ɂ���Splayer��Ԃ�
+	 * @param instanceId
+	 * @return
+	 */
+	public List<Player> getPlayers(String instanceId) {
+		if (instanceId == null || instanceId.equals("")) {
+			return getPlayers();
+		}
+		List<Player> responsePlayers = new ArrayList<>();
+		for (Player player : playerMap.values()) {
+			String[] instanceURISplit = player.getInstanceURI().split("/"); // �c/instances/{instanceId}
+			if (instanceId.equals(instanceURISplit[instanceURISplit.length - 1])) {
+				responsePlayers.add(player);
+			}
+		}
+		return responsePlayers;
+	}
 
 	public Player getPlayer(String playerId) {
 		return playerMap.get(playerId);