A network terminal device having a Web service function includes means for providing a Web page to a user via a network, and means for providing a Web service using SOAP to the user via the network. The network terminal device may have a system structure including a first service layer for managing a hardware of a machine, an application layer for providing an operations display function of the machine to the user by using the first service layer, and a second service layer having a function call conforming to a SOAP schema or a program interface to the application layer.