| 摘要 |
When an IC card is inserted into a mobile communication terminal, a reading unit reads the identification number of the IC card from the IC card and then notifies it to an identification unit, and the identification unit determines whether or not the acquired information is stored in a storage unit. When the identification number of the inserted IC card is not stored in the storage unit, the identification unit makes a request of a display unit to display a request to input a password peculiar to the portable telephone terminal. The identification unit then recognizes a password input by a user, and, when determining that the input password differs from the password peculiar to the portable telephone terminal, makes a request of a locking unit to lock the portable telephone terminal. The locking unit then locks the portable telephone terminal so as to disable it.
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