PORTABLE TERMINAL APPARATUS AND USE RESTRICTING METHOD

摘要

It is an object to provide a portable terminal apparatus capable of improving a usability while maintaining a security, and a use restricting method thereof. A portable terminal apparatus 1 carries out a radio authentication together with a radio communicating unit 3. The portable terminal apparatus 1 gives a predetermined alarm to a user, thereby improving a usability when a distance from the radio communicating unit is set to be an alarm distance D2 to be a shorter distance before the distance from the radio communicating unit is set to be an authentication enable distance D1.