1. An image pick-up apparatus comprising: an image pick-up unit configured to pick up an object image; an image pick-up instructing unit configured to instruct the image pick-up unit to pick up the image; a focus adjusting unit configured to adjust focus of the object image picked up by the image pick-up unit; a control unit configured to control the image pick-up unit and focus adjusting unit in accordance with one instruction by the image pick-up instructing unit to pick up the object image two times and controls to obtain an in-focus image and an out-of-focus image; and a synthesizing unit configured to generate a synthesized image by synthesizing the out-of-focus image with the in-focus image.