To correctly distinguish speech from noise in an actual use environment.
To distinguish a speech block from a non-speech block over the whole block from the start to the end of a speech with respect to the inputted speech, this speech recognition system is provided with a speech block detecting part 103 for detecting the speech block by detecting information on the non-speech block. This detecting part 103 detects power levels of steady or unsteady noise and all other sound, and specifies the power level indicating the start and end of the speech in accordance with the power level fluctuating every moment. If the power level of an inputted speech exceeds the above specified power level, it is judges as the start of the speech, and if it is lower than the specified power level for a predetermined period of time or longer, it is judged as the end of the speech.
KONDO KAZUO
KOKUBO HIROAKI
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