Updating music content or program to usable state in cooperation with external electronic audio apparatus

A storage section stores therein one or more sets of music content and/or function executing programs, at least a part of the sets of music content and/or function executing programs being set in a non-usable state at least in an initial state. An audio signal containing additional information is received from an external electronic audio apparatus, and a determination is made as to whether the additional information satisfies a predetermined condition. If the additional information satisfies the predetermined condition, any of the sets of music content and/or function executing programs, stored in the storage section, that is currently set in the non-usable state is updated to a usable state. A model of the external electronic audio apparatus is identified, and any of the sets of music content and/or function executing programs that corresponds to the identified model is updated to the usable state.