In order to enable to manage each service by paying attention to the services provided on the network, a network managing part which manages network element including the network, a physical link or a path is provided. Further, a service managing part which manages the services which are provided on the network and a work managing part which manages a work definition of the user which is connected to the network are provided. In response to a request from the user, information from the service managing part and the work managing part is referred, thereby generating visually provided information to the user.