| 摘要 |
PURPOSE: A method and a system for providing position information are provided to offer position information for indicating a current position of a portable communication device such as a portable phone to a holder of a communication terminal device such as another portable telephone. CONSTITUTION: Portable telephones A and B are connectable to a position information service center(3). The telephone A has a GPS(Global Positioning System) processing circuit for measuring its own position, and a control circuit. The control circuit prepares position information on the basis of the measurements obtained by the GPS processing circuit, also prepares a list comprising the number of a plurality of telephones in response to an input manipulation by a user, and transmits prepared list data to the position information service center(3). When an information request signal is supplied from the telephone B to the position information service center(3), a server transmits position information about the telephone A to the telephone B only when the number of the telephone B is not included in the list data. Thus, a system is adapted to reliably protect the privacy of person carrying the telephone A.
|
