RELAY DEVICE

A replay device includes: multiple transceiver units that transmits and receives a communication frame, each transceiver unit including a register in which at least data indicating a set-up content relating to an operation of a respective transceiver unit is written; a register access unit that is connected with each transceiver unit through an interface; and a control unit that transmits a control message to the register access unit. The control message includes access target information for designating one or more access target transceiver units, and access content information indicating an access content to a register of each access target transceiver unit. The register access unit sets the one or more target transceiver units designated by the access target information, and perform an access to the register of each access target transceiver unit according to the access content.