1. An image processing method, comprising: an object detection step of detecting one or a plurality of specific objects from an input image; a first area estimation step of estimating a first area in which identification information for identifying the object exists, from a position of the object detected in said object detection step; a second area detection step of detecting a second area including the identification information, within the first area estimated in said first area estimation step; an image processing step of performing image processing with respect to the second area detected in said second area detection step; and an identification information recognition step of performing recognition processing of the identification information with respect to a processing result in said image processing step, and associating a result of the recognition processing with the input image.