Abstract: A processing method for identifying data by an audio conversion device includes: connecting the audio conversion device to a first terminal; sending an identification code stored in the audio conversion device to the first terminal, and sending the identification code to a server via the first terminal, wherein the identification code is used to identify the audio conversion device; obtaining user data; uploading the user data to the server, such that the server stores a correspondence between the identification code and the user data; connecting the audio conversion device to a second terminal; sending the identification code stored in the audio conversion device to the second terminal; sending a data obtaining request containing the identification code to the server; and receiving the user data sent corresponding to the identification code in response to the data obtaining request, or receiving multimedia data matching multimedia using feature information in the user data.