1. An image sensing apparatus comprising: a focus detection unit including a plurality of focus detection regions in a frame; a determination unit configured to determine whether said focus detection unit has captured an object during servo autofocus in which said focus detection unit repeats focus detection even after obtaining an in-focus object image so that a focus follows motion of the object; and a selection unit configured to, when a focus detection region to be focused is selected from said plurality of focus detection regions, select a first focus detection region if said determination unit determines that the object has not been captured, and select, as a focusing target, a focus detection region indicating a second focus detection result nearer to a previous focus detection result than in said first focus detection region if said determination unit determines that the object has been captured.