Device user interface with topology map

(57) In order to display various components which constitute a summary network system, the topology map of a network system is created and it displays on a display. Various components are displayed by using the icon showing each component. If new equipment is connected to a network, the graphical picture showing this equipment will be automatically displayed on a graphical user interface. Similarly, if a certain equipment is removed from an IEEE1394 serial bus, it will become shade and will remain until the graphical picture showing this equipment becomes gray, this equipment is connected again or the power supply of a digital network is come by off. In a concrete example, a user specifies sources-of-information equipment and a receiving set by operating an icon in order to make the data transfer between sources-of-information equipment and a receiving set perform. Furthermore, in other cases of the operation, one or more task windows are during an interface, and the help which chooses the task by which a user is performed is carried out. Once it is chosen, the data relevant to a control command and a task will be displayed into the control viewing window of a graphical user interface. Data transfer is a data transfer of both a video data, audio information, a video data, and audio information. In the concrete case of the operation, the digital network is based on the IEEE1394 serial bus standard.