An electronic musical instrument has a protected storage unit in which a plurality of music content data are preset and stored in an unusable state where a user cannot freely use. A content selection unit is operated by the user to select a desired one of the music content data from the plurality of the music content data. A content use control unit causes an external settlement apparatus to make settlement for purchasing the desired music content data to thereby enable use of the desired music content data selected by the content selection unit, and brings the desired music content data into a usable state when a completion notification indicating that the settlement is completed is received from the external settlement apparatus. A play unit is operable to use the desired music content data for generating or reproducing music sounds according to the desired music content data.