1. An image output apparatus comprising: an input module configured to input 3D images; a separator configured to separate a plurality of left-eye images and a plurality of right-eye images from the 3D images; a first image processor configured to process the plurality of left-eye images or the plurality of right-eye images; a second image processor configured to process the plurality of right-eye images or the plurality of left-eye images; and a controller configured to execute control to output the plurality of left-eye images or the plurality of right-eye images processed by at least one of the first image processor and the second image processor.