A relay apparatus of the present disclosure is a relay apparatus which is connected to a host apparatus by a first communication method and to a terminal apparatus by a second communication method, and which transmits data to the terminal apparatus and receives data from the terminal apparatus in accordance with an instruction from the host apparatus, the relay apparatus including a communication quality measuring unit which extracts communication quality of the second communication method, a packet processor which detects an error in connection with the terminal apparatus, and an error transmission determining unit which changes timing of notifying the host apparatus of the error detected in the packet processor in accordance with the communication quality extracted in the communication quality measuring unit.