Provided is a relay device including: a relay unit configured to perform a relay process for a frame transmitted and received between a plurality of function units; and a relay management unit. The relay unit receives, from a function unit, a target frame which is transmitted and received according to a predetermined communication protocol and includes information with which a request source of a service is identifiable and information with which a content of the requested service is identifiable, and the relay unit outputs the received target frame to the relay management unit. The relay management unit performs determination regarding setting change in the relay process of the relay unit, on the basis of the information included in the target frame received from the relay unit, and outputs the target frame to the relay unit or discards the target frame, according to a result of the determination.

Provided is a relay device including: a relay unit configured to perform a relay process for a frame transmitted and received between a plurality of function units; and a relay management unit. The relay unit receives, from a function unit, a target frame which is transmitted and received according to a predetermined communication protocol and includes information with which a request source of a service is identifiable and information with which a content of the requested service is identifiable, and the relay unit outputs the received target frame to the relay management unit. The relay management unit performs determination regarding setting change in the relay process of the relay unit, on the basis of the information included in the target frame received from the relay unit, and outputs the target frame to the relay unit or discards the target frame, according to a result of the determination.