Communication system, relay device, and communication method

A relay device that (i) is connected to a plurality of first devices, (ii) includes a communication means for exchanging data with the first devices, and a wireless communication means that exchanges data wirelessly with a second device, and (iii) relays a data exchange between the plurality of first devices and the second device, the relay device comprising:

• a selection means for, if the wireless communication means receives data, selecting a storage destination for received data out of the plurality of first devices;
• a storage destination storage means for storing the first device that was selected by the selection means;
• a data transmission means for transmitting received data to the first device that was selected by the selection means;
• a data requesting means for, if data is to be transmitted to a second device, making a request to the first device that was stored in association with the data in the storage destination storage means, requesting the first device to transmit the data;
• and
• a data reception means for receiving data transmitted from the first device,
• wherein the wireless communication means transmits data received by the data reception means to a second device.

A communication method of relaying a data exchange between a plurality of first devices and a second device using a relay device that (i) is connected to the plurality of first devices, (ii) exchanges data between the first devices, and (iii) exchanges data with the second device using wireless communication, the method comprising:

• selecting, if data from the second device has been received, a storage destination for the received data out of the plurality of first devices;
• storing the selected first device,
• transmitting the received data to the selected first device;
• requesting, if data is to be transmitted to the second device, the first device that was stored in association with the data to transmit the data;
• receiving the data that was transmitted from the first device that is the storage destination;
• and
• transmitting the received data to the second device.