1. A method for obtaining music data, comprising:reading an identification code from a removable memory card inserted in a memory card slot provided on an earphone body or an earphone wire control device, wherein the identification code is uniquely associated with the memory card;
sending the identification code to a mobile terminal so that the mobile terminal sends the identification code to a first server, and the first server retrieves stored music data corresponding to the identification code from a plurality of music servers and automatically returns the stored music data in an audio format, corresponding to the identification code, to the mobile terminal;
receiving a music signal converted by the mobile terminal after the mobile terminal obtains the music data from the server, wherein the music signal corresponds to the identification code;
reading equalizer configuration information stored on the memory card and transmitting it to the mobile terminal, enabling the mobile terminal to adjust sound intensity of the music signal in various frequency ranges based on the equalizer configuration information; and
outputting the music signal,
wherein sending the identification code and the equalizer configuration information to the mobile terminal comprises sending a pre-defined acceptance notice in the form of an audio signal prior to sending the identification code and the equalizer configuration information to the mobile terminal so that the mobile terminal starts receiving the subsequent transmitted identification code and equalizer configuration information after detecting the acceptance notice.