An information processing system which processes machine-readable code information which is printed, together with human-readable information, on a print medium. The apparatus includes a reading unit which reads the machine-readable code information, a decoding unit which decodes the machine-readable code information read by the reading unit, to generate decoded information, an information storing unit which stores at least a portion of the decoded information as stored information, and a processing unit which determines a processing operation to be performed, based on the decoded information and the stored information, and performs the determined processing operation.