| 摘要 |
PROBLEM TO BE SOLVED: To inhibit recorded information from leaking when a mobile communication terminal device is lost.SOLUTION: A lock control method of a mobile communication terminal device which records business information, includes the steps of: detecting a state of a radio wave received by the mobile communication terminal device from a base station; prohibiting use of the mobile communication terminal device by locking the mobile communication terminal device, when the state of radio wave indicates that the mobile communication terminal device has been out of a communication service zone for a predetermined time or more; and authorizing use of the mobile communication terminal device by releasing the lock of the mobile communication terminal device, only when authentication is successfully performed by non-contact communication with a predetermined release key. And also, the lock of the mobile communication terminal device is released only when specific use conditions related to pre-registered work are satisfied. |
