9. The apparatus according to claim 8 , wherein the user information estimation unit estimates an emphasized section, which the speaker emphasizes and utters, in a sound section of the input sound, and wherein the matching unit performs matching between the search result target pronunciation symbol string and the recognition result pronunciation symbol string by weighting a pronunciation symbol in the emphasized section in the recognition result pronunciation symbol string, which is represented by the user information.
9. The apparatus according to claim 8 , wherein the user information estimation unit estimates an emphasized section, which the speaker emphasizes and utters, in a sound section of the input sound, and wherein the matching unit performs matching between the search result target pronunciation symbol string and the recognition result pronunciation symbol string by weighting a pronunciation symbol in the emphasized section in the recognition result pronunciation symbol string, which is represented by the user information. 10. The apparatus according to claim 9 , wherein the user information estimation unit estimates the emphasized section based on pitch, power, or an utterance speed of the input sound.