Private information supplying system for mobile stations, method for displaying private information and method for roughly positioning users

摘要

A private information supplying system is established in a mobile telephone network, and the mobile stations are assumed to be at the positions of base stations presently communicating; an information service center produces a piece of relative position between users on the basis of the current positions, and transmits the piece of relative position when the user permits the other user to acquire it; the private information supplying system does not require any assistance of the GPS so that the system is economical and does not disturb the privacy.