An information interchange unit, a storage unit, and a display controller are configured such that, after a image selection unit selects a first image and a second image, the information interchange unit interchanges, automatically, first image information of the first image with second image information of the second image, or interchanges, automatically, first position information of the first image with second position information of the second image, the storage unit stores and correlates the first image information and the second position information, and stores and correlates the second image information and the first position information, and the display controller controls, automatically, a display to display the one image based on the first image information and the second position information, and the another image based on the second image information and the first position information.