Patent ID: 7313405

Claim:
A radio communication system comprising: a plurality of mobile terminals and a management apparatus communicating with the plurality of mobile terminals via a communication network; each mobile terminal including: a radio communication portion having a radio communication function; a location acquisition portion acquiring a locating information of the mobile terminal; and a first control portion making the radio communication portion transmit at least the locating information when receiving a request from the management apparatus; the management apparatus including: a storing portion storing a position information of each mobile terminal based on the locating information transmitted from the plurality of mobile terminals; and a second control portion periodically transmitting the request to the plurality of mobile terminals; judging current positions of mobile phones based on the locating information from each mobile terminal that was transmitted with the request; storing the judged position information of each mobile terminal into the storing portion; judging whether the locating information has been received or not from all the mobile terminals that were transmitted with the request; specifying a mobile terminal from which the locating information has not been received in response to the request and specifying a position information of the mobile terminal from which the locating information has not been received based on the position information stored in the storing portion; and transmitting the position information of any specified mobile terminal stored in the storing portion to at least one other mobile terminal.