3. The machine translation device according to claim 1 , wherein the style and domain recognition part determines whether the caption sentence conforms to a literary style or a colloquial style by comparing frequency of the last word of the caption sentence occurring in the colloquial style with frequency of the last word of the caption sentence occurring in the literary style based on the predicate ending/style statistical dictionary.
3. The machine translation device according to claim 1 , wherein the style and domain recognition part determines whether the caption sentence conforms to a literary style or a colloquial style by comparing frequency of the last word of the caption sentence occurring in the colloquial style with frequency of the last word of the caption sentence occurring in the literary style based on the predicate ending/style statistical dictionary. 4. The machine translation device according to claim 3 , wherein a knowledge format of the predicate ending/style statistical dictionary is {last word/frequency in colloquial style/frequency in literary style}.