POSITION SEARCH SYSTEM, A MOBILE INFORMATION TERMINAL, A POSITION SEARCH METHOD AND A RECORDING MEDIUM WHICH RECORDS A POSITION SEARCH PROGRAM

[Problem] Even if a mobile information terminal which is the target of the position search exists in the position where it is difficult to acquire the position information by GPS, the information is provided which enables to specify the position of the mobile information terminal. [Means for Solution] A mobile information terminal of the present invention comprises a wireless communication means receiving a radio wave from a wireless base station and performing the location registration in said wireless base station, a position information acquisition means acquiring the position information, a storage means storing the position history information that is a set of said position information and the information on said wireless base station at the time when said position information has been acquired, and a control means recording said position history information to said storage means whenever a predetermined fluctuation occurs to said radio wave reception condition.