A conversion-to-note apparatus comprising: a key which is operated by a user; a memory ; and a processor which obtains, from the memory , first information to associate a key operation on the key with an open/closed state of a tone hole or virtual tone hole and second information to associate the open/closed state of the tone hole or virtual tone hole with a note, identifies, based on the first information, the open/closed state of the tone hole or virtual tone hole for the key operation detected, and determines, based on the second information, the note for the identified open/closed state of the tone hole or virtual tone hole characterized in that the memory stores the first information which shows, for each of pairs of keys including the key and tone holes or virtual tone holes, which of an open state, a closed state and a dependent open/closed state should be the open/closed state of a tone hole or virtual tone hole in a pair if a key in the pair is operated, wherein the dependent open/closed state indicates a state in which the tone hole or virtual tone hole is in the open state or the closed state depending on a key operation on another key, and the processor determines the open/closed states of the respective tone holes or virtual tone holes based on the open/closed states stored, in the first information, for the key operation detected. a key which is operated by a user; a memory ; and a processor which obtains, from the memory , first information to associate a key operation on the key with an open/closed state of a tone hole or virtual tone hole and second information to associate the open/closed state of the tone hole or virtual tone hole with a note, identifies, based on the first information, the open/closed state of the tone hole or virtual tone hole for the key operation detected, and determines, based on the second information, the note for the identified open/closed state of the tone hole or virtual tone hole characterized in that obtains, from the memory , first information to associate a key operation on the key with an open/closed state of a tone hole or virtual tone hole and second information to associate the open/closed state of the tone hole or virtual tone hole with a note, identifies, based on the first information, the open/closed state of the tone hole or virtual tone hole for the key operation detected, and determines, based on the second information, the note for the identified open/closed state of the tone hole or virtual tone hole characterized in that the memory stores the first information which shows, for each of pairs of keys including the key and tone holes or virtual tone holes, which of an open state, a closed state and a dependent open/closed state should be the open/closed state of a tone hole or virtual tone hole in a pair if a key in the pair is operated, wherein the dependent open/closed state indicates a state in which the tone hole or virtual tone hole is in the open state or the closed state depending on a key operation on another key, and the processor determines the open/closed states of the respective tone holes or virtual tone holes based on the open/closed states stored, in the first information, for the key operation detected. <EOS>