| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of improving the processing efficiency in database retrieval. SOLUTION: The database managing method for managing a database to perform retrieving processing, has a step for generating an identification number for identifying data, which are the target of retrieving processing, a step for reading the contents of additional information corresponding to the generated identification number while referring to an additional information bit map storing the additional information showing whether the data exist in the database or not, and a step for retrieving the relevant data when the read additional information shows the presence of these data, and suppressing the retrieval of the relevant data when the additional information does not show the presence of these data.
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