1. A method of processing an image by using image division, comprising: dividing an image frame into multiple subblocks having a predetermined pixel size; constituting multiple macroblocks by sampling respective pixels corresponding to an identical position, differing from each of others of adjacent positions, within respective subblocks of the multiple subblocks; and constituting multiple slices by classifying the multiple macroblocks based on a criterion of the identical position, differing from the others of the adjacent positions, within respective subblocks of the multiple subblocks.