1. A diagnosis support apparatus comprising: a wide-area image acquisition unit adapted to acquire a wide-area image of an eye portion; a detection unit adapted to detect a lesion candidate on the eye portion by analyzing the wide-area image acquired by said wide-area image acquisition unit; a determination unit adapted to determine parameter associated with acquisition of a tomogram of the eye portion, based on a lesion candidate detection result obtained by said detection unit; and a tomogram acquisition unit adapted to acquire a tomogram of the eye portion based on the parameter determined by said determination unit.