| 摘要 |
PROBLEM TO BE SOLVED: To simply know the position of the opposite side. SOLUTION: When a signal requesting the detection of the present position of a portable terminal 20B is outputted from a portable terminal 20A, a nearest base station 21A transmits this signal to a server 25. When the server 25 receives the request signal, it receives the present position of the portable terminal 20B via a base station 21B, and it reads out the map data including the present position of the portable terminals 20A, 20B from a data base 26 and transmits the map data to the portable terminals 20A, 20B. |
