| http://www.w3.org/ns/prov#value | - Thereby, in the index file 212 shown in FIG. 4, the index which stores identifier (hereinafter referred to as a document ID), which indicates documents including each of the words, is stored according to each word, and information such as the frequency of occurrence of each of the words, is also stored according to each document ID, as shown in FIG. 6(a). [0106] Meanwhile, the search criteria gene
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