To report the fact of detachment without a time delay when a terminal to be searched is detached from a body by providing a sensor, with which the detachment from the prescribed mount is detected, while integrating or connecting it with the terminal to be searched.

The sensor for detecting the detachment from the prescribed mount is provided while being integrated or connected with the terminal to be searched and at the time of detachment detection, the terminal to be searched reports at least one of its own stored CS (cell) ID (identification code/number), its own PS (terminal) ID (identification code/number) and the fact of detachment to a searching side telephone directly or through the mediation of an exchange station. The detachment sensor forms an electric switch in the state (A) of turning on two metal pieces 1 and 2, which are elastic and mutually contacted, provided in the terminal to be searched, for example, an insulator 3 is inserted from the outside and turned off at all the time, when that insulator is bound by a string or the like and the terminal to be searched is detached, the insulator is removed, a contact is turned on and the specified program of the terminal to be searched is activated.