| 摘要 |
A mobile device system and a communication device which can flexibly respond to the living environment to prevent misplacement are provided. In each mobile device, outside a specified area which is registered in advance, when a combination of other mobile devices detected as being located within a predetermined range of that device does not match a combination of other mobile devices registered in a group registration unit, misplacement of a mobile device is announced by operating an announcing unit. Inside the specified area on the other hand, even if the combination of other mobile devices detected as being located within the predetermined range of that device does not match the combination of other mobile devices registered in the group registration unit, the announcing unit is not operated.
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