| 摘要 |
PURPOSE:To efficiently execute high-speed retrieval by down loading information from an on-line data base after limiting a retrieval object file to proper quantity by a private file. CONSTITUTION:For the side of the terminal of a user, a private data base 20 having an inherent keyword file 17 peculiar to the user, a covalent keyward file 18, and an inherent inverted file 19 to indicate the corresponding relations between an inherent keyword and the on-line data base is provided. When the on-line data base is to be retrieved, first, the retrieval object file is limited to the proper quantity by the private data base 20 with a command and a data format standardized for the user, and after that, the information is down loaded from the on-line data base with the standardized command for the user.
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