We propose a method to generate large-scale encyclopedic knowledge, which is valuable for much NLP research, based on the Web. We ﬁrst search the Web for pages containing a term in question. Then we use linguistic patterns and HTML structures to extract text fragments describing the term. Finally, we organize extracted term descriptions based on word senses and domains. In addition, we apply an automatically generated encyclopedia to a question answering system targeting the Japanese InformationTechnology Engineers Examination. .