1. An image capturing apparatus comprising: an image capturing unit which captures an image of an object and outputs image data; an image generating unit which generates through images indicating different compositions based on the image data output from the image capturing unit, wherein the through images indicating different compositions have respective centers at different coordinates of the image data; a display control unit which controls a display unit to simultaneously display a through image of the image data output from the image capturing unit and the through images indicating different compositions generated by the image generating unit; and a focus control unit which controls a focus automatically; wherein the image generating unit includes a region setting unit which sets at least one region on the image captured by the image capturing unit in accordance with a focus area focused by the focus control unit.