Abstract: The embodiments of the present invention relate to a method and an apparatus for training an absolute pitch, to an electronic musical instrument, and to a sound source processing apparatus. According to one embodiment of the present invention, an absolute pitch training apparatus is provided, comprising: an output request input unit for taking, as an input, an output request for a specific sound; an overtone output unit for outputting an overtone, the number of vibrations of which is greater than the basic number of vibrations for a specific sound; and a compound tone output unit for outputting a compound tone in which a fundamental sound, having a basic number of vibrations, and an overtone for a specific sound are mixed. According to one embodiment of the present invention, an absolute pitch training method for training an absolute pitch is proposed, enabling persons necessarily requiring an absolute pitch to train so as to achieve an absolute pitch.