Document retrieval program N characters index generating device, document retrieval device, N character index generation method, document retrieval method, and N characters index generation program

摘要

PROBLEM TO BE SOLVED: To reduce storage cost by reducing the size of N-character indexes stored in a disk device even when large volumes of documents are registered.;SOLUTION: An index volume recording part 130 estimates the size of each N-character index (integer of N≥1) set as an object of generation in an N-character index generation definition information table 192. A disk space acquisition part 131 refers to a free space of an N-character index storage part 190 for storing each N-character index as N-character index information 191. If the total size of N-character indexes to be generated is larger than the space, an N-character index modification part 123 selects N-character indexes not to be generated in the order of size or "n". The N-character index modification part 123 may select N-character indexes other than a 1-character index not to be generated. An N-character index generation part 121 generates N-character indexes to be generated and registers them as the N-character index information 191.;COPYRIGHT: (C)2009,JPO&INPIT