3. The post-editing apparatus of claim 2 , wherein the error-specific language model is built in such a way that factors required for correction of errors for respective error types are separately defined for word choice error, word presence error, and word order error based on the corpus for which dependency was analyzed.
4. The post-editing apparatus of claim 3 , wherein the word choice error is at least one of an error in selection of a translated word such as a noun, a verb, an adjective, an adverb, an article, a preposition, and an auxiliary verb, an error in singular/plural agreement, and an error in determining whether singular or plural.