Patent ID: 7539485

Claim:
An apparatus used in a first mobile communication system with a plurality of wireless base stations, the first mobile communication system operated by a first provider, the apparatus comprising: first means for acquiring identification information of the plurality of wireless base stations; second means for detecting a present location of the apparatus on acquiring the identification information of the plurality of wireless base stations; third means for storing first service location information with respect to the first provider in which the identification information acquired by the first means is associated with the present location of the apparatus detected by the second means; and fourth means for calculating locally a location of the plurality of wireless base stations using the detected present location of the apparatus stored in the third means, and to exchange locally calculated first service location information and second service location information with respect to a second provider through an ad hoc network with a second apparatus in a second mobile communication system that is operated by the second provider, wherein the fourth means is configured to provide a user with information based on the first service location information and the second service location information.