To prevent a user from forgetting to input the identification number by prompting a user to input the password if it is the time to input the identification number when identifying user information.

When a user passes an ID card through an ID card reader, a signal processing section 10 determines whether the ID card has been registered previously. If it is found to be a registered one, it is judged if it is the time to input the identification number. If it isn't the time to input the identification number, it is judged if the situation requires input of the identification number. If it is the time to input the identification number, the signal processing section 10 notifies a prescribed message with a display section 15 or a speaker SP, prompting the user to input the identification number. On this occasion, if the user instructs the postponement of input by a postponement instruction key 16A or a ten-key 16B, the signal processing section 10 registers the performance in a storage section 11 and prompts the input of the identification number at the next ID code identification time. At this time, the user is disabled from performing the postponement instruction operation, thereby preventing the user from forgetting to input the identification number.