A fingering guide displaying apparatus is to guide a player or a learner how to finger wind musical instruments in playing. As most of wind musical instruments are transposing instruments, the fingering patterns are indicated for the respective notes on the music scores notated in the respective tonalities which are unique to the respective instruments. The apparatus stores a fingering pattern database representing fingering patterns for the respective available notes of various transposing instruments in the respective instrument tonalities, and a transposition value database representing, for each of the instrument tonalities, the pitch difference between the instrument tonality and the reference tonality. When music playing data expressed in the reference tonality are used for playing a transposing instrument, the playing data are converted to express the notes in the instrument tonality using the pitch difference value, and fingering patterns are also indicated in the instrument tonality.