1. A display control apparatus comprising: calculating means for calculating the degree of similarity of each of a plurality of second images to a selected first image; display control means for controlling displaying of the second images in the order of similarity; and selecting means for selecting, in response to an instruction from a user, one second image from among the plurality of second images displayed in the order of similarity, wherein the selected one second image is of a group of images identified by a same group identification as belonging to a predetermined group, the predetermined group being determined in accordance with image capturing date; in response to the selection of the one second image, the display control means controlling the displaying of the selected one second image and a third image belonging to the predetermined group, so that the third image and the selected one second image are displayed in the order of image capturing time in the predetermined group and the displaying switches between (i) the displaying of the second images in the order of similarity to the first image with the first image and the selected one second image displayed in an expanded view and (ii) the displaying of the third image belonging to the predetermined group and the selected one second image in the order of image capturing time.