15. A speech recognition method according to claim 14 , wherein the step of performing the word search comprises the steps of: identifying at least one of a word and a continuous word; identifying a phoneme in at least one of the word and the continuous word using the language model; and identifying an interval of a vowel of the phonemes.
15. A speech recognition method according to claim 14 , wherein the step of performing the word search comprises the steps of: identifying at least one of a word and a continuous word; identifying a phoneme in at least one of the word and the continuous word using the language model; and identifying an interval of a vowel of the phonemes. 16. A speech recognition method according to claim 15 , wherein the step of identifying the interval comprises the step of identifying, as the vowel interval, an interval from a start time to an end time of a hypothesis of the vowel in the word search.