| 摘要 |
A search method that uses an index file consisting of a key file that includes key character strings, and a position data file that includes position data corresponding to the key character strings, a position data delete flag is correlated with a specific key character string, and position data that correspond to the specific key character string are deleted from the position data file. Where A denotes the size of an index at which the contents of the position data file are to be deleted, B denotes the amount of position data for each keyword that is to be deleted at that time, and C denotes the amount of position data for a keyword that is to be deleted because the data can not be employed for the search. When (1) the size of the overall index file reaches A for the first time, a position data delete flag is set that corresponds to a key character string for which the amount of the position data is equal to or greater than B while the position data are deleted from the position data file; and/or when (2) the size of the entire index file exceeds A, a position data flag is set that corresponds to a key character string for which the amount of position data is equal to or greater than C, and the position data are deleted from the position data file.
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