information such as the article code, article name, unit price, etc., the CPU 11 judges that the wireless tag data is the data read from the article tag 7.When the wireless tag data is not the data read from the article tag 7, the CPU 11 returns to the processing in step ST2, and waits for the next wireless tag data.When the wireless tag data is the data read from the article tag 7, the CPU 11 acq