| 摘要 |
Even when the mobile devices which one carries change from day to day, the invention can flexibly handle such changes to prevent misplacement and the like of a mobile device. Each mobile device includes a communication unit for communicating with other mobile devices, a GPS receiver for acquiring current location information of the mobile device, a group registration unit, an announcing unit, and a control unit. In each mobile device, other mobile devices located within a predetermined range of that mobile device are registered as a group in the group registration unit, and after this registration, the other mobile devices located within the predetermined range of the mobile device are periodically detected, and when the combination of detected other mobile devices does not match the combination of other mobile devices registered in the group registration unit, the announcing unit is operated.
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