| 摘要 |
PURPOSE:To eliminate the need to communicate with a host computer so as to check a password number by using at least check a digit for checking the password number. CONSTITUTION:A terminal device 1 has a keyboard 2 and a microprocessor 3 and is connected to a center host computer 5 through a communication line 4. At least one check digit is used to check the password number. This check digit is inputted together with essential input information other than the password so that a user is unaware, and it is checked in the terminal device 1 whether or not the check digit and a manually inputted password number are in predetermined relation, thereby checking the password number.
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