Method and apparatus for recognizing speech

PURPOSE: A voice recognizing method and a device thereof are provided to obtain features about both a short section and a long section of a voice wherein features of time are reflected to the long section. CONSTITUTION: A segment dividing unit(531) partitions a voice signal into segment sections. A temporal length of a segment section is longer than a temporal length of a frame section. A segment feature extracting unit(532) extracts a segment voice feature vector around a partition boundary portion of the segment section. A segment voice recognizing unit(533) recognizes a voice using the segment voice feature vector and a segment based probability model. A combination synchronizing unit(540) combines a voice recognizing result of a frame based voice recognizing unit with a voice recognizing result of the segment voice recognizing unit.