Communication system, electronic device, electronic timepiece, communication method

An electronic device comprising:

• a transmission part transmitting an optical signal;
• and
• a controller transmitting a transmission-frequency measurement for measuring the transmission frequency of data from the transmission part and transmitting the data from the transmission part.

An electronic timepiece comprising:

• a receiving part receiving an optical signal including time data;
• and
• a controller specifying a transmission frequency of data including time data transmitted from another electronic device based on a transmission-frequency measurement signal for measuring a transmission frequency received by the receiving part and receiving the data based on the specified transmission frequency by the receiving part to correct time by the data.

A communication method in a communication system including a first electronic device and a second electrode device, comprising the steps of:

• performing control to transmit a transmission-frequency measurement signal for measuring a transmission frequency of data and to transmit the data by using a transmission part which transmits an optical signal by the first electronic device;
• and
• performing control to specify the transmission frequency of the data based on the transmission-frequency measurement signal received by a receiving part which receives the optical signal and to receive the data by the receiving part based on the specified transmission frequency by the second electronic device.