1. An image processing apparatus, comprising: a display control unit configured to display on the display apparatus a composite image comprising a plurality of images while dynamically changing the plurality of images; an receiving unit configured to receive output commands during displaying of the composite image on the display apparatus by the display control unit; and a selection unit configured to display, so that a user can select as an image to be output, either the composite image at a timing before or after a timing at which the output command has been received by the receiving unit.