A sever manages a network device connected to a network by storing location information of a providing site that provides state information associated with the network device and a status of the network device. The server determines whether a change in state of the network device has occurred by communicating with the network device, and if so, acquires the stored location information. Then, the server generates an electrical message (an e-mail message, for example) which contains the acquired location information associated with the network device and the determined state of the network device. The electrical message is sent by the server to a user's computer related to a predetermined address such tat the location information can be used by a displaying application in the user's computer to acquire information related to the network device.