| 摘要 |
PROBLEM TO BE SOLVED: To improve a reproduction rate while the precision of retrieval is highly maintained. SOLUTION: A computer 1 reads patent literature (primary information) from a data base 3, extracts secondary information on a bibliographical item and an index word and stores them in an auxiliary storage device 7. A user inputs a retrieval expression by using a keyboard 4 and a pointing device 5 while he views a display device 2. When the method of the coappearance of the index word is regulated by an OR approximate operator in the retrieval expression, the computer 1 refers the inputted index word with the index word extracted from literature with a sentence range designated by the operator as a reference unit. Literature from which matched index words among the prescribed number of the index words, which is decided to originally be matched, and the index words which the user designates to be matched are extracted is selected as fitted literature.
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