A casino system displaying instant monitoring images includes a correlation table that can be implemented in a casino management system or a casino monitoring system. The correlation table registers the gambling apparatus and the corresponding monitor lens to establish correlation therebetween. Hence the casino management system requires merely to record the number of the gambling apparatus and occurring time and event type of a corresponding special event to issue a signal to request the casino monitoring system to find out the monitor lens corresponding to the gambling apparatus according to the correlation table and send instant monitoring images captured by the monitor lens to the casino management system. Thus management personnel can instantly get the instant monitoring images of the special event and take suitable actions immediately.