| 摘要 |
PURPOSE: A secret number managing method is provided to enable a user to easily manage a secret number by automatically deleting a secret number of an apparatus when a time elapses after inputting the secret number. CONSTITUTION: The secret number managing method comprises the steps of: inputting a secret number by a user (S10); and maintaining the set secret number during a predetermined time, wherein the set secret number is elongated by unit time when the user inputs a secret number elongation key. The predetermined time is 24 hours, and is hand-operated by an input of the user. A time for maintaining the secret number is stored in a nonvolatile semiconductor memory device(70), and a preset time is maintained and pursued by a timer(82).
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