1. An image recognizing apparatus comprising: a dictionary memory configured to store dictionary data; a block determining module configured to determine that a target block comprising a target pixel to be processed of a plurality of pixels in image data is a shared block to which the dictionary data is used or a mirror block to which the dictionary data to the shared block is used, based on a position of the target block; and a recognizing module configured to use common dictionary data for the shared block and the mirror block, and recognize characteristic portion of the image expressed by the image data.