1. An image processing apparatus comprising: a display; a retrieving unit that retrieves image data; a process display unit that displays on the display a plurality of candidate image processes to be performed on the image data; a process receiving unit that receives a plurality of instructions indicating a plurality of selected image processes selected from among the plurality of candidate image processes; a process storing unit that stores the plurality of selected image processes; a thumbnail display unit that displays a thumbnail image corresponding to the image data on the display; and a thumbnail designating unit that designates a thumbnail image, wherein the thumbnail display unit displays a processed thumbnail image that represents a result of the plurality of selected image processes performed at one time on the image data corresponding to the designated thumbnail image before performing the plurality of selected image processes on the image data corresponding to the designated thumbnail image.