MOBILE PHONE LOSS PREVENTION SYSTEM AND MOBILE PHONE LOSS PREVENTION PROGRAM

PROBLEM TO BE SOLVED: To provide a system that allows a user to learn without delay the loss and the like of part of a plurality of mobile phone terminals if the user carry around the plurality of mobile phone terminals.SOLUTION: A mobile phone loss prevention system consists of a plurality of mobile phone terminals that are connected via a communication network and have a function to measure and transmit the current position of its own terminal, and a server device. The server device obtains the respective current position data of the plurality of mobile phone terminals associated with each other and registered, calculates mutual distance among the plurality of mobile phone terminals, and determines whether there is a mobile phone terminal whose calculated distance exceeds a prescribed threshold. When it is determined that there is a mobile phone terminal whose calculated distance exceeds the prescribed threshold, the server device gives caution notice of warning for loss and the like to a registered notification destination associated with the plurality of mobile phone terminals associated with each other and registered including the mobile phone terminal.