A robot system capable of checking the status of all robot controllers connected to the same network by using at least one robot controller, among the robot controllers, having a function for checkingthe status. The robot system includes a plurality of robots and a plurality of robot controllers for controlling the robots. The robot controllers are connected to each other via a control network and also connected to an information network. The robot controller, having the function of checking the status, transmits and receives data to and from the other robot controllers and, further, indicates information, concerning the statuses of the networks and the robots, on a display of a teaching operation panel of the at robot controller.