A semiconductor integrated circuit that has a quick response to changes in sourcedrain electrode voltage having an LDMOS transistor. The method and apparatus provide encoding an image by using a code factor table in conjunction with a set of element codes. An identification module 40 compares the extracted pattern with inherent patterns of radio wave transmitted from plural devices, which use the radio wave in the predetermined frequency band and include the target wireless communication device, and thereby identifies the propagation environment of the radio wave transmitted from the target wireless communication device.