To provide a certificate information display device which automatically corrects a key code which is erroneously inputted from the uniqueness of the key code and the particularity of the job of a user against the erroneous input of the key code.
When the inputted key code is not matched with the key code which is previously stored in a code accumulation part 80, a certificate information display device selects the key code from the code accumulation part 80 with the uniqueness of the number of digits, which is decided by the type of the key code, and the particularity of the job of the user by the use situation of the key code as conditions, and automatically corrects the selected key code as the key code inputted from an operation part 60.
MORIMOTO KAZUTOSHI
IWATA KOICHI
