processing circuitry configured to:

receive a packet transmitted from a transmission terminal, the packet including main data and redundant data generated on a basis of a redundancy degree determined on a basis of a retransmission timeout period that is a time determined according to a parameter based on a combination of the transmission terminal and the reception terminal at a time of connection and in which retransmission processing of the main data can be repeatedly executed and used for restoration or interpolation of the main data; and

decode reproduction data by decoding the main data or the redundant data, wherein the received packet comprises the main data and the redundant data in one packet;

a main data buffer that accumulates the main data; and

a redundant data buffer that accumulates the redundant data, wherein the processing circuitry is further configured to:

communicate with another reception terminal that receives a packet transmitted from the transmission terminal;

make a request for the redundant data corresponding to the reproduction data to the other reception terminal in a case where the main data corresponding to the reproduction data is not in the main data buffer and the redundant data corresponding to the reproduction data is not in the redundant data buffer; and

receive the redundant data transmitted from the other reception terminal in response to the request.