Provided is a communication relay apparatus configured to relay communication between a plurality of segments of a network by a plurality of communication devices including an indoor unit and an outdoor unit connected to one another via the network, the communication relay apparatus including a relay setting unit configured to set a first mode value corresponding to processing of relaying all frames and a second mode value corresponding to processing of relaying a frame on the basis of a destination address of the frame, and a relay determination unit configured to perform processing of relaying the frame in an operation mode corresponding to a relay mode value set by the relay setting unit.