A robot system according to the present invention comprises a control apparatus for controlling a robot, and a video display apparatus connected to the control apparatus. The video display apparatus comprises a display unit which displays an image of a real space containing the robot, in real time as the image is taken by a camera, and an augmented reality image processing unit which causes a virtual image of an end effector or robot peripheral equipment of the robot to be displayed on the display unit in superimposed fashion on a real image of the robot taken by the camera. According to the robot system, even when the end effector or the robot peripheral equipment is not present, a robot teaching task can be performed by assuming that they are present.