A transfer device stores unicast addresses in association with a multicast address, where the multicast address is used for multicasting data to a plurality of transmission destination devices each serving as a transmission destination of the data, and the unicast address is used for transmitting data from the transfer device to a transmission destination device directly connected to the transfer device. Upon receiving first data to be transmitted to the transmission destination device, when a unicast address associated with a multicast address assigned to the first data is stored in the transfer device, the transfer device generates second data by changing the multicast address assigned to the first data into a unicast address that is associated with the multicast address, and transfers the second data to one of the plurality of transmission destination devices directly connected to the transfer device.