12. The apparatus of claim 10 , wherein, for the calculating of the acoustic score, the processor is configured to use, as the acoustic score of the adjacent frame, a statistical value based on determined acoustic scores of two frames of the first speech, of the extracted select frames, which are temporally on both sides of the adjacent frame, or based on calculated acoustic scores of two frames of the second speech corresponding to the two frames of the first speech, or use, as the acoustic score of the adjacent frame, a statistical value obtained by applying a weighted value to each determined acoustic score of the two frames of the first speech, or to each determined acoustic score of the two frames of the second speech, based on respectively determined temporal distances between the adjacent frame and the two frames of the first speech.
10. The apparatus of claim 1 , wherein, for the calculating of the acoustic score, the processor is configured to use acoustic scores of frames of the second speech, calculated by the acoustic model, as determined acoustic scores of respective frames of the first speech that correspond to the frames of the second speech, and derive an acoustic score of one of the frames other than the select frames, as an adjacent frame and being adjacent to one or more of the respective frames of the first speech, based on one or more acoustic scores of the frames of the second speech and/or one or more of determined acoustic scores of the respective frames of the first speech.