1. A voice recognition system comprising: a signal processing unit for converting inputted speech voice data into a feature; an acoustic model storing unit in which an acoustic model obtained by modeling what kind of feature a voice tends to have is stored in advance; a vocabulary dictionary storing unit in which information of a recognition vocabulary is stored in advance; a voice section detecting unit for detecting voice sections in the speech voice data according to a predetermined voice section criterion; a priority determining unit for selecting a voice section that includes a self-repair utterance from among the detected voice sections detected by the voice section detecting unit according to a predetermined priority criterion, without using any result of recognizing a speech vocabulary sequence; a decoder for calculating a matching score with the recognition vocabulary using the feature of the voice section selected by the priority determining unit and the acoustic model; and a result output unit for outputting a word sequence having the best score in the matching by the decoder as a recognized result.