1. A searching apparatus using a combination of X ray and millimeter wave signal, which comprises an X ray signal emitter including an electronic element producing X ray signal; an X ray signal detector for receiving an X ray signal; a millimeter wave emitter provided in a millimeter wave transceiver and including an electronic element for producing millimeter wave; a millimeter wave detector for receiving millimeter wave; an image processor for deducing image of an object from the received X ray and millimeter wave signals; a comparator for comparing the deduced image with the corresponding data from the image data base for objects already input; and a display for displaying the image deduced from the image processor and for giving an alarm, as required.