Patent ID: 7633885

Claim:
A route computing system for computing a route, comprising: a transmission device; and a terminal device; wherein the transmission device comprises: destination information receiving means for receiving destination information indicative of computed routes, destination information storing means for storing destination information supplied thereto, routing packet sending means for sending a received routing protocol packet, and route computation processing switching means for determining whether the terminal device is connected to the transmission device and, if the terminal device is found connected, causing the routing packet sending means to send the received routing protocol packet to the terminal for calculation of routes, while permitting the destination information receiving means to receive destination information from the terminal device, instead of computing routes by the route computation processing switching means itself, and if the terminal device is found not connected, computing routes based on the received routing protocol packet and supplying the computed routes to the destination information storing means, and wherein the terminal device comprises: routing packet receiving means for receiving the routing protocol packet sent from the transmission device, computing means for computing destination information based on the received routing protocol packet, and destination information sending means for sending the computed destination information to the transmission device.