| 摘要 |
A short distance wireless communication function ( 140 ) such as Bluetooth is provided as a communication function part, which is subordinate to a main communication function having a communication function like that of a usual portable telephone set for making communication via a network. Among other units present in the neighborhood, those conforming to preset search conditions are set as limited opposite side units ( 110, 120, 130 ) for direct data transmission to these opposite side units ( 200, 300 ) with a close distance wireless communication function ( 140 ).
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