Updated regularly. Provides access to various reference sources, including dictionaries (Japanese, English and multi-languages, such as the Dictionary of Synonyms in Japanese), encyclopedias (Encyclopedia Nipponica, Encyclopedia of Japan, Kodansha Encyclopedia of Japan, etc.), other Japanese reference works (biographies, maps, chronologies, etc.), full text Tōyō Bunko and Shūkan Ekonomisuto (Weekly Economist), and other visual and sound databases. Also includes its sub-series: 日本歴史地名大系 and 国史大辞典.