An image processing apparatus according to the present invention includes: a display control unit configured to display a partial region of an original image on a first screen; and a changing unit configured to change the region to be displayed on the first screen in response to a user's operation, wherein the display control unit displays a list of a plurality of representative images corresponding to a plurality of original images each on a second screen, and wherein the representative images displayed on the second screen are based on partial images corresponding to regions of the original images changed by the changing unit each.