On a display device, a lenticular lens is arranged in a state where a periodic direction thereof is inclined with respect to the horizontal direction. Within a maximum predetermined viewing angle defined by two viewpoint images with the largest parallax, a viewpoint adjustment unit sets a first angular region where there is a high possibility that one or more eyes may be present when an observer observes the display device, and a second angular region where there is a low possibility that one or more eyes may be present. The viewpoint adjustment unit adjusts the viewpoints so that a parallax between adjacent viewpoint images in viewpoint images to be presented in the first angular region is reduced more than a parallax between adjacent viewpoint images in viewpoint images to be presented in the second angular region.