In a robot control system, the distance from an operating region of a robot arm to a person who is approaching the region is measured using a laser sensor. Information necessary to acquire a safety skill level that is stored in an RFID tag possessed by the person is acquired using an RFID reader. A controller classifies distances into a short distance, which is a distance within the operating region of the arm, a long distance, which is a distance that exceeds a movable region of the arm, and an intermediate distance, which is a distance between the short distance and the long distance. The motion of the arm is controlled by the controller, depending on the distance (i.e., the long distance, the intermediate distance, or the short distance) and the safety level.