An image generation system includes an image information acquisition section that acquires image information from an image sensor, a motion information acquisition section that acquires motion information about an operator based on the image information from the image sensor, an object control section that moves an object in a movement area based on the motion information about the operator, and an image generation section that generates an image displayed on a display section. The object control section limits movement of the object so that the object does not move beyond a movement limiting boundary set in the movement area even when it has been determined that the object has moved beyond the movement limiting boundary based on the motion information.