An image generation apparatus includes: a generation unit that generates an output image in which a foreground mask image overlaps a background image, the foreground mask image having been generated based on a moving object included in an input image; an update unit that executes update processing for updating at least a partial area within the background image based on the input image; and a restricting unit that restricts reflection of the update processing in a restricted area compared to other areas, the restricted area being at least a partial area in the output image.