A method including acquiring a source image and depth information of the source image, determining, using depth information, an overlapping region in which some pixels of a source image are shifted and a plurality of pixels overlap, calculating a weight for the overlapping region with a processor, using distance information with respect to a foreground region of the source image and a background region of the source image, generating, using the depth information and the overlapping region, a foreground-depth image in which the foreground region is extended and a background-depth image in which the background region is extended, generating a foreground image using the source image and the foreground-depth image, generating a background image using the source and the background-depth image, and generating, using the weight from the overlapping region, at least one of a left-eye image and a right-eye image by synthesizing the foreground image and the background image.