PURPOSE: To change an ID discrimination rule with a ten-key pad, and set password numbers to be elements simple and hard to forget, and secure security property.

CONSTITUTION: By pushing the sharp key # of a ten-key pad 1c, the ID number of a card is checked, and when it is OK, then a mode 'under monitoring intrusion' is released, and is turned into a mode 'firm closing' for a door 2. When the sharp key # is not pushed, and when the ID number of the card is found OK as a result of checking, then the door 2 is set in a mode' firm opening'. Then, without any limit to the number of digits, the input of the password number according to a specified rule is provided by ten-key pad operation, and on entering a room, a following mode 'under monitoring intrusion' is set by pushing the sharp key # and by checking the ID number of the card.