Abstract: Provided is a technique which includes inputting a plurality of multi-lingual texts and using multi-lingual text corpora, thereby generating a higher-accuracy third language text as compared to the input of a unilingual text which has heretofore taken place. After inputting the texts, the processes for analyzing, converting and generating are performed, and a target language document text is outputted. The generation of target language document text does not require a large-scale corpus because information characteristic of the language can be automatically acquired.