Object detecting means detecting the position and ID information of the object from the output of the radio tag reader, the human detection sensor and the camera, to the first and second time acquired thehuman detection data indicating the presence of human.
Object detecting means 500 for detecting the position and ID information of the object from the output of the radio tag reader 100 and the human detection sensor 200 and the camera 300, to the first and second time acquired the human detection data indicating the presence of human If the data for the first and second object ID information corresponding is determined different from each other, the difference between the first and second image data corresponding to the respective times calculated to detect the object position.