The present invention is to provide a wearable electronic device applied to an electronic commerce system, wherein the wearable electronic device is configured to be in communication with an information management server located in a cloud end through short-range wireless communication between the wearable electronic device and a network communication device, the wearable electronic device is also able to play audio files, store audio property of the audio files as an audio preference record and transmit the audio preference record to a streaming audio server located in the cloud end through the network communication device and the information management server sequentially, and the streaming audio server can then directly update the audio file stored in the wearable electronic device according to the audio preference record through the network communication device, so as for the client to enjoy the latest and favorite audio during sport through wearing the wearable electronic device.