A communication method for electronic devices includes: determining whether a transmission line is occupied or unoccupied; based on a determination that the transmission line is unoccupied: transmitting transmission data via the transmission line; receiving return data that returns via the transmission line after the transmission data has been transmitted; and determining whether data collision exists on the transmission line by comparing the transmission data with the return data, and based on a determination that the transmission line is occupied: waiting for a predetermined first time interval to elapse; and after the predetermined first time interval has elapsed, returning to the determining whether the transmission line is occupied or unoccupied.