1. An apparatus for generating a fully focused image, the apparatus comprising: a depth map generation unit generating a depth map of an input image obtained by a multiple color filter aperture (MCA) camera; a channel shifting & alignment unit extracting subimages which include objects with same focal distance based on the depth map, and performing color channel alignment and removing out-of-focus blurs for each subimages obtained from the depth map; and an image fusing unit fusing the subimages to generate a fully focused image.