A component picked up by a suction nozzle of a component mounting machine is imaged by a camera, the captured image is processed by an image recognition system to recognize the component, the image is determined to be normal or abnormal based on the recognition result, and in addition to classifying the image as a normal image or an abnormal image and storing the image in a storage device, component mounting boards, unloaded from a component mounting machine, are inspected with an inspection device. A stored image reclassification computer acquires the inspection result from the inspection device, reclassifies the normal image stored in the storage device, based on the inspection result, as an image whose determination as a normal image is suspect or as an image whose determination as a normal image is not suspect, and then stores the normal image in the storage device.