1. An image generation system comprising: an image information acquisition section that acquires image information from an image sensor; a skeleton information acquisition section that acquires skeleton information based on the image information from the image sensor, the skeleton information specifying a motion of an operator; a reliability information acquisition section that acquires reliability information that indicates reliability of the skeleton information; and an image generation section that generates an image displayed on a display section, the image generation section generating an image corresponding to the acquired reliability information as the image displayed on the display section.