12. The speech recognition apparatus according to claim 10 , wherein the pronunciation information in the setting unit is at least one of a pronunciation sequence related to reading of the target word to be recognized, a detailed pronunciation sequence which is a state sequence of a pronunciation sequence which has been modeled by a state translation model, and a reference pattern sequence related to the target word to be recognized.
10. A speech recognition apparatus comprising: a speech inputting unit configured to start input of speech made by a user in response to a user's operation; a determination unit configured to determine whether beginning of the input speech is missing; a setting unit configured to set pronunciation information for recognizing the input speech of which the beginning is not missing in a case where a head portion of a speech waveform power does not exceed a predetermined threshold value, and setting pronunciation information for recognizing the input speech of which the beginning is missing in a case where the head portion of the speech waveform power exceeds the predetermined threshold value; and a speech recognition unit configured to recognize the input speech using the set pronunciation information.