To facilitate authentication and also to improve accuracy by storing a prescribed part of a movement locus person himself and authenticating that the person is himself by means of reproduction of the locus information.

An owner of a terminal 01 sets a position information detection timing, then moves, and receives a position information output signal from a position information output device 10, and detects position information with a position information detecting part. Locus data is crested by repeating the above processing several times and recording it on a recording part 15, and a seconding part 16 modulates it and outputs it. A center 02 demodulates this signal and registers it together with an inherent ID, etc., on a registering part 21, a terminal 01 or the owner. In the case of the personal authentication, trajectory information is inputted by indicating it on a map in accordance with a request from the center 02. In the center 02, a collating part 22 compares and collates it with the locus data of the part 21, a deciding part 24 makes allowable decision and the result is outputting to an outputting part 26 to be authenticated. Thus, there is no need for carrying the terminal 10 at all times, and convenience is also improved.