PROBLEM TO BE SOLVED: To improve the efficiency of aggregating routes.;SOLUTION: A route aggregation device 1 exchanges routes with a different network device 2 through a network. The route aggregation device 1 includes: a storage part 21 for storing a destination and an adjacent transmission destination as information for specifying the routes; and a control part 20 for creating a route table 40 including the routes with a form of a binary tree, adding even an unadvertised route as an aggregatable route to the route table 40, and aggregating the unadvertised route added to the route table 40 and routes holding information of an arbitrary adjacent transmission destination.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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