1. An apparatus which transitionally displays images from a person image to a supplementary image related to the person image, comprising: a classification part which classifies the person image and the supplementary image together as belonging to a common event, wherein the common event is automatically determined based on at least one of (A) shooting times of the respective images, and (B) shooting locations of the respective images; a selection part which selects, in accordance with the automatically determined common event, the supplementary image; a display part which displays the person image and the supplementary image; and a display control part which controls a transitional display from a display state of only the person image through a state in which the supplementary image is displayed with a first size near a pupil of the person image to the display state of only the supplementary image with a second size larger than the first size.