The present invention is intended to make it easier to perform positioning of a detection device when detecting surface characteristics of a sensing object. The invention includes a detection device, a processing part, a guidance information generation part and an informing part. The detection device detects reflection light from a sensing object by irradiating light onto the sensing object. The processing part calculates surface characteristics of the sensing object by processing data from the detection device. The guidance information generation part generates information about a distance and/or an attitude of the detection device relative to the sensing object. The informing part informs the information about the distance and/or the attitude generated by the guidance information generation part.