Location recognition apparatus and method of Ic tag

Interrogator 1, unique ID, after reading Xa, Xb, and Xc, by specifying the ID transmitting a probe signal outgoing command. Each relevant IC tag transmits a probe signal in order. IC tag 2 adjacent stores ID of interrogator specifies, Xa, Xb, and Xc in the memory as adjacent ID. Then interrogator 1 reads the adjacent ID. Controller, unique ID, Xa, Xb, Xc and adjacent ID (Xb), (Xa · Xc), the combination of (Xb) (Xa-Xb), Request (Xb-Xc). The combined end connecting obtain (Xa-Xb-Xc).