13. The speech recognition apparatus according to claim 12 , wherein the statistic model storing unit stores a statistic model which can be taken by the segment relation value calculated for each combination of the target segment and the adjacent segment in association with the combination of the target segment and the adjacent segment, and the likelihood calculating unit calculates the likelihood of the result of the speech recognition based on the statistic model which is associated with the combination of the target segment and the adjacent segment.
12. The speech recognition apparatus according to claim 11 , further comprising: a statistic model storing unit that stores a statistic model which the segment relation value can take; and a likelihood calculating unit that calculates a likelihood that indicates a likelihood of the recognition candidate based on a distribution of the segment relation values in the statistic model and the segment relation value obtained for the target segment, wherein the recognition result selecting unit selects a recognition result from the recognition candidates stored in the recognition candidate storing unit with the use of the likelihood.