PURPOSE: To reach and find a specific article simply and rapidly while movement is being made, by calling a calling number opposing the specific article by means of a parent transmitter, and catching the radiation portion of a child receiver provided at the opposing specific article, and referring to the specific article.

CONSTITUTION: At the information office or the like of a parking lot, a vehicle registration number is registered at a parent transmitter 1 as a vehicle proper calling number, and at the same time a child machine number is also registered, and a signal matching with one child receiver 2 opposing these is made. Next, the receiver 2 is provided at the top portion of a vehicle, and the vehicle is carried into an appropriate position in the parking lot by an operater. In order to take out a specific vehicle out of a number of vehicles carried like that, the calling of the specific vehicle is made by a calling operation as the transmitter 1 is being carried, and then, a specific wireless signal is transmitted by an execution operation, and the child machine receiver 2 opposing this is radiated. This radiation can be confirmed from a distance of tens of meters away, so an objective reference vehicle can be simply found by catching this radiation and reaching the vehicle.