1. A speech recognition apparatus comprising: a sound information acquiring unit that acquires sound information; a unit segment dividing unit that divides the sound information into plural unit segments; a segment information acquiring unit that acquires segment information that indicates a feature of each unit segment; a segment relation value calculating unit that calculates a segment relation value that indicates a relative feature of a target segment which is a unit segment to be processed with respect to an adjacent segment which is a unit segment adjacent to the target segment, based on segment information of the target segment and segment information of the adjacent segment among the segment information; a recognition candidate storing unit that stores recognition candidates that are targets of speech recognition; and a recognition result selecting unit that selects a recognition result from the recognition candidates stored in the recognition candidate storing unit utilizing the segment relation value.