7. The machine translation device according to claim 1 , wherein the morpheme analysis part tokenizes the caption sentence in units of morphemes by performing morpheme analysis based on at least one selected from the group comprising of heuristic rules suitably specialized for the recognized style and domain, a common morpheme analysis dictionary, a pre-analyzed morpheme statistical dictionary, and the dictionaries loaded into the dynamic translation DB by the dynamic translation knowledge construction part.
9. The machine translation device according to claim 7 , wherein a knowledge format of the pre-analyzed domain-specific context dictionary is {corresponding word_left morpheme vocabulary1_left morpheme vocabulary2_*_right morpheme vocabulary pre-analysis frequency}.