A sound device comprising: an audio-information output unit configured to output an audio information; an analysis unit configured to receive the audio information outputted from the audio-information output unit, and then output a sound-spectrum information of the audio information inputted thereto; an audio-division-spectrum output unit configured to receive the sound-spectrum information of the audio information, and then output an audio-division-spectrum information indicative of a sound-volume information for each critical band width of the sound-spectrum information of the audio information inputted thereto; a noise-division-spectrum output unit configured to output a noise-division-spectrum information indicative of a sound-volume information for each critical band width of a noise; and a correction unit configured to correct the audio-division-spectrum information based on the noise-division-spectrum information, and then output a correction-division-spectrum information indicative of thus corrected audio-division-spectrum information, wherein the correction unit includes: a switching unit including a plurality of division-switching units, each of the division-switching units being configured to pass therethrough or block the audio-division-spectrum information for each critical band width; a switching control unit configured to receive the noise-division-spectrum information, and then control the switching unit to operate each division-switching unit so as to pass therethrough or block the audio-division-spectrum information based on the noise-division-spectrum information inputted to the switching control unit; and a computing unit configured to receive the audio-division-spectrum information and an output from the switching unit, and then weight and add the audio-division-spectrum information and the output from the switching unit. an audio-information output unit configured to output an audio information; an analysis unit configured to receive the audio information outputted from the audio-information output unit, and then output a sound-spectrum information of the audio information inputted thereto; an audio-division-spectrum output unit configured to receive the sound-spectrum information of the audio information, and then output an audio-division-spectrum information indicative of a sound-volume information for each critical band width of the sound-spectrum information of the audio information inputted thereto; a noise-division-spectrum output unit configured to output a noise-division-spectrum information indicative of a sound-volume information for each critical band width of a noise; and a correction unit configured to correct the audio-division-spectrum information based on the noise-division-spectrum information, and then output a correction-division-spectrum information indicative of thus corrected audio-division-spectrum information, wherein the correction unit includes: a switching unit including a plurality of division-switching units, each of the division-switching units being configured to pass therethrough or block the audio-division-spectrum information for each critical band width; a switching control unit configured to receive the noise-division-spectrum information, and then control the switching unit to operate each division-switching unit so as to pass therethrough or block the audio-division-spectrum information based on the noise-division-spectrum information inputted to the switching control unit; and a computing unit configured to receive the audio-division-spectrum information and an output from the switching unit, and then weight and add the audio-division-spectrum information and the output from the switching unit. a switching unit including a plurality of division-switching units, each of the division-switching units being configured to pass therethrough or block the audio-division-spectrum information for each critical band width; a switching control unit configured to receive the noise-division-spectrum information, and then control the switching unit to operate each division-switching unit so as to pass therethrough or block the audio-division-spectrum information based on the noise-division-spectrum information inputted to the switching control unit; and a computing unit configured to receive the audio-division-spectrum information and an output from the switching unit, and then weight and add the audio-division-spectrum information and the output from the switching unit.