SIMPLE INPUTTING METHOD FOR CREDIT CARD NUMBER OR THE LIKE IN NETWORK SYSTEM

PROBLEM TO BE SOLVED: To obtain a simple inputting method capable of easily and safely inputting a credit card number in the case of ordering merchandise or a service from a cyber mall, etc., in a network such as the Internet or inputting the credit card number, a merchandise number, etc., in the case of ordering merchandise through the network from a mail shopping catalog, etc. SOLUTION: The credit card number, etc., is inscribed with a barcode on the front surface or the rear surface of the credit card, etc. In the mail shopping catalog, etc., the merchandise number, etc., of the merchandise is inscribed with a barcode. Furthermore, a pen-type barcode reader is connected to a network terminal device such as a personal computer, a portable telephone set coping with a network connected to the network such as the Internet and the barcode is read with the pen-type barcode reader, thereby the credit card number, etc., is inputted.