1. A focus control apparatus comprising:
a receiving unit configured to receive images which respectively correspond to different exit pupil areas of a lens;
a first detection unit configured to detect a contrast of an image generated by an image generation unit compositing images
shifted from each other, wherein the images shifted from each other respectively correspond to different exit pupil areas;
a second detection unit configured to detect a phase differnce between images, wherein the images respectively correspond
to images of different exit pupil areas; and
a controller configured to control a focus position based on the results of the first and second detection units.