1. A display control apparatus comprising: a plurality of first acquiring units each of which is configured to acquire image data; a determining unit configured to determine, as a display target, image data acquired by at least one of the first acquiring units on the basis of an acquisition result of the plurality of first acquiring units; and a setting unit configured to set a first display mode, in which two or more images based on two or more image data acquired by two or more of the first acquiring units are displayed side-by-side, in a case where the two or more image data are determined as the display targets, and to set a second display mode, in which one image based on one image data acquired by one of the first acquiring units is displayed, in a case where the one image data is determined as the display target, wherein in a case where a plurality of image data are acquired and formats of the plurality of image data are not the same, the determining unit determines one format based on the formats of the plurality of image data, and determines one or more image data having the determined one format as the display target.