Disclosed is an image output apparatus that outputs a plurality of image data to one or a plurality of image display apparatuses capable of controlling amounts of light of backlights, the image output apparatus including: a determining unit configured to determine whether the plurality of image data satisfy a predetermined condition; and a controlling unit configured to control, when the determining unit determines that the plurality of image data satisfy the predetermined condition, the one or the plurality of image display apparatuses such that either or both of amounts of light and number of light emission control units of the backlights used for display of the plurality of image data are the same.