Abstract: A network-connection device applicable between a voice communication device and a first server enables a user to enjoy the information service of the first server through the voice communication device. The network-connection device mainly comprises a connection unit, a transmission unit, a conversion unit, an output unit, and a power supply. By connecting the network-connection device coupled to the voice communication device with a communication network, a subscriber might enjoy information service of a first server through the voice communication device. A method for the first server to provide information service comprises a procedure for network connection; a procedure for identification; and a procedure for server login. After completion of above procedures, the server will provide information service upon receipt of a subscriber's requests.