A component mounter images suction states of components picked up by a suction nozzle, processes images of the suction states of the components to recognize the suction state of the component, and stores the images in a storage device with linking production information related to the components. An inspection machine images a mounted state of each component on a board, processes an image of mounted state of each component to recognize the mounted state of each component, and inspects whether a mounting error occurred for each component based on the recognition result. The inspection machine determines that a mounting error occurred for any of the components the image of the mounted state of the component for which a mounting error was determined to have occurred and a searched image of the suction state of the component are displayed on the display monitor in a comparative manner.