| 摘要 |
Location information providing unit of gateway server 40 obtains location information on cellular telephone 10, 20 and 30 each produced in different expression format from measuring center 50 , converts obtained location information into expression formats which IP server 80 A and IP server 80 B can deal with via location information converting device 60 , and notifies converted location information to IP server 80 A and 80 B. As a result, IP server 80 A and 80 B can obtain location information on each cellular telephone 10, 20 , and 30 without experiencing any difficulty.
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