The invention provides a network system. An apparatus sends a first notice including a first information for determining the apparatus to a management server, the management server sends a second notice including the classification of an image pattern to the apparatus, the apparatus displays the image pattern in the second notice on a display picture thereof, the management server sends a third notice for indication of searching the image pattern displayed by the apparatus to a camera server, the camera server sends a fourth notice for indication of shooting to a camera, the camera sends the shot image to the camera server when shooting the image pattern displayed by the apparatus according to the fourth notice, the camera server evaluates the shot image, sends a fifth notice including a second information for determining the camera and the evaluated result to the management server, the management server stores the first information and the second information accordingly dependent on the evaluated result when receives the fifth notice.