A network system enables controlling an image input device without requiring a driver that depends on the computer environment. A client terminal has a component that acquires a web page having an embedded scanner control script that controls image input from a scanner; a component that sends an image acquisition request through an interface board to the scanner as controlled by the scanner control script; and a component that gets an image from the scanner as a response to the image acquisition request as controlled by the scanner control script. The interface board receives the image acquisition request, and sends the image scanned by the scanner based on the received image acquisition request to the client terminal.