In an embedded business apparatus, a Web server function receives a network protocol request including an IP address by a network protocol daemon and a port number, processes the request, and responds to the request by sending a network protocol response. The request includes an obtained request of port information including a port number specifying the port, and the Web server function includes the response including the port information obtained by processing the obtained request and including Web information making it possible for a user to input a change instruction for changing the port information.