| 摘要 |
PROBLEM TO BE SOLVED: To enable a user to use a spare mobile phone terminal to perform communications in the same manner as a current mobile phone terminal, even when the current mobile phone terminal is made unavailable, due to the occurrence of an unexpected accident like breakage or submergence. SOLUTION: The same user data are preliminarily stored in a plurality of mobile phone terminals 11A and 11B. When the current mobile phone terminal 11A is used to access a mobile phone infrastructure system 10, information, indicating that the mobile phone terminal 11A is accessing, is registered in a spare unit control database 15 of a space unit recognition part 14, until the access is terminated. When another mobile phone terminal 11B having the same user data accesses the system 10, the access to the system 10 is rejected in the case that information indicating that the mobile phone terminal 11A, having the same user data is accessing is already registered in the spare unit control database 15. As long as the current mobile phone terminal 11A is not used, the user can perform communications, in the same manner as the mobile phone terminal 11A by using the spare mobile phone terminal 11B. COPYRIGHT: (C)2007,JPO&INPIT
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