11. A speech recognition method comprising the steps of: performing a word search based on an acoustic distance between a phonetic model and a feature amount of input speech and a phoneme of a word in a language model including the phoneme and a prosodic label of the word, outputting a word hypothesis and a first score representing likelihood of the word hypothesis as a word search result, and when assuming that a recognition result of the input speech is the word hypothesis, outputting a prosodic interval and a prosodic label of the prosodic interval in the input speech; outputting a second score representing likelihood of the output prosodic label based on one of feature amounts of the input speech corresponding to the output prosodic interval; and correcting the output first score of the word hypothesis using the output second score, wherein the prosodic label is one of a tone label and an accent type, and the prosodic interval is one of a vowel interval and an accent interval.
11. A speech recognition method comprising the steps of: performing a word search based on an acoustic distance between a phonetic model and a feature amount of input speech and a phoneme of a word in a language model including the phoneme and a prosodic label of the word, outputting a word hypothesis and a first score representing likelihood of the word hypothesis as a word search result, and when assuming that a recognition result of the input speech is the word hypothesis, outputting a prosodic interval and a prosodic label of the prosodic interval in the input speech; outputting a second score representing likelihood of the output prosodic label based on one of feature amounts of the input speech corresponding to the output prosodic interval; and correcting the output first score of the word hypothesis using the output second score, wherein the prosodic label is one of a tone label and an accent type, and the prosodic interval is one of a vowel interval and an accent interval. 12. A speech recognition method according to claim 11 , wherein the correcting step comprises one of the steps of correcting a score of a word hypothesis under processing in the word search, and correcting a score of an intermediate result obtained as a result of the word search.