1. A two-dimensional code recognition processing method for recognizing a two-dimensional code comprising: generating binary data from image information obtained by imaging said two-dimensional code in accordance with a predetermined threshold value; detecting a reference cell, used as a reference in recognizing said two-dimensional code, based on said binary data generated in said binary data generating step; detecting a plurality of basic cells for defining an area of said two-dimensional code, each located in a predetermined search range with respect to said reference cell detected in said reference cell detecting step, on the basis of said binary data generated in said binary data generating step; creating an image of the defined area from image information obtained by imaging said two-dimensional code in accordance with a predetermined threshold value; converting the image of the defined area into a detection compatible fronto-parallel image; and detecting two-dimensional code data, assigned to said two-dimensional code, located inside the converted image of the defined area.