Abstract: In a network management system, information items respectively of connection relationships, containment relationships, and display priority of a plurality of managed object instances (resources) are stored in a memory. According to a predetermined algorithm, there is calculated an evaluated value for display for each of the instances depending on the containment relationship information and display priority to select a limited number of instances representable on a screen. Displayed on the screen is a network layout diagram including icons representing the plural instances thus selected. When the user specifies one of the icons, the specified instance and a number of representable instances selected according to the evaluated values from a group of instances under the specified instance in the containment relationships are displayed in a new network layout diagram on the screen.

Abstract: A network management system prepares an optimum configuration table corresponding to a failure of a transit trunk and distributes the same to each TDM, and thereby the optimization of reconfiguration of a high-speed digital network is enabled.User data are transmitted and received in accordance with route information table defined beforehand in each TDM. On the other hand, network management information is sent to all trunks other than a receiving trunk for the managing information when flooding is designated by the network management system. Accordingly, the management information can be sent without fail if any route to the TDM to be supplied with the management information exists. When source-routing is designated, the communications of the managing information can be implemented efficiently, since the route is set by the management information.