| 摘要 |
PROBLEM TO BE SOLVED: To speed up retrieval processing for extracting desired data from a vast data list. SOLUTION: An original data group is stored in an original data area, and information showing a storage place in the original data area of each piece of original data is stored in a place corresponding to a hash value of the original data in an index area. When performing retrieval, a hash value of a retrieval key is calculated, and the information showing the storage place of the original data is extracted in reference to the place corresponding to the hash value in the index area. Next, the desired original data are extracted in reference to the place shown by the information in the original data area, and it is decided whether the finally extracted original data accord with the retrieval key or not. COPYRIGHT: (C)2007,JPO&INPIT
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