Electronic systems and data to set the rate of return method

The invention discloses an electronic system capable of automatically setting the data return rate. The electronic system comprises a first electronic device, a second electronic device, a transmission interface and a processing unit, wherein the first electronic device is capable of transmitting data to the first electronic device by virtue of the transmission interface; the processing unit is capable of automatically setting the data return rate of the second electronic device or the transmission interface according to the type of software executed by the first electronic device.