A communication apparatus generates an IP network communication path on a local interface, which is constituted of a USB between a computer and the communication apparatus, or the like, using a PPP or the like, and communicates through the IP network communication path with the computer. The computer uses a general-purpose network application like a WEB browser for accessing a resource of the communication apparatus through the local interface. In addition, the communication apparatus provides domain name service and service such as IP packet routing, and the like, for the computer through the local interface. A user in a host apparatus side can use a unified interface for the user's operation and setup operation of a communication apparatus without being limited to an interface of accessing the communication apparatus.