The Materials Information Technology Station (MITS) of the National Institute for Materials Science (NIMS), has developed a system of integrated retrieval of information from databases together with those of major research organizations in the world by linking to the Materials Database Network provided by Granta Design Ltd. The MITShas offered eleven kinds of databases on structural materials (4 kinds of database systems), basic properties (4 kinds of database systems), superconducting materials (2 kinds of database systems), and polymers (1 database system) on its website (http://mits.nims.go.jp) since April, 2003. Granta Design Ltd., on the other hand, has established the Materials Database Network (MDN, http://matdata.net/index.jsp) due to linking materials databases operated by worldwide research organizations as well as developing materials databases from the standpoint of material selection for equipment design, enabling users to retrieve necessary materials information. The databases of eight organizations in U.K. and U.S. had been linked to this Network. Due to the combination of NIMS Materials Database with GD Materials Database Network, still more user-friendly database environment was established, and the users can easily obtain pertinent data and information for material development and for optimal material usage by retrieving information not only from NIMS Materials Database but also from the databases in U.K. and U.S.