Server apparatus, by controlling flight vehicle, causes flight vehicle to fly to a close range of a power-transmission line, and causes flight vehicle to capture images of the power-transmission line. Flight vehicle includes a positioning apparatus of GPS, and the flight of flight vehicle is controlled based on this measured position. On the other hand, each base station in communication network is provided with a positioning apparatus of GPS. The measured position of base station measured by the positioning apparatus is used to specify the error in position of flight vehicle determined by the positioning apparatus. Server apparatus restricts the flight of flight vehicle if the error in position of flight vehicle, which is determined by the positioning apparatus, that captures images of the power-transmission line is a threshold value or more.