1. An image recognition apparatus which recognizes objects, comprising: a memory which stores, for each of a plurality of objects to be recognized, identification information corresponding to code information attached to the object and image information for recognizing the object; an interface which acquires a photographed image; and a processor programmed to: extract a target object region including an object therein from the acquired image, determine whether code information is attached to the object in the extracted target object region, extract the code information attached to the object in the extracted target object region and retrieve the identification information stored in correspondence with the extracted code information, if the code information is attached to the object in the extracted target object region, and recognize the object based on an image of the extracted target object region and the image information for each object stored in the memory, if the code information is not attached to the object in the target object region.