Provided is a communication node apparatus that can attempt optimal utilization of a communication resource of a communication interface mounted on each node apparatus. A communication node apparatus (transmission node apparatus 101) includes a plurality communication interfaces (transmission interfaces 201-1 and 201-2 and reception interfaces 202-1 and 202-2), enables communication that uses a plurality of communication paths with an opposing apparatus, and includes a means (reception interface aggregate calculation unit 204) for changing an aggregation of reception interfaces addressable as destinations for data to be transferred to the opposing apparatus via each of the plurality of transmission interfaces so as to maximize the communication performance using the plurality of communication paths simultaneously in response to a change in communication performance of each of the transmission interface and the reception interface.