Compressing method, compressing apparatus, and computer-readable recording medium

Abstract

A non-transitory computer-readable recording medium stores a compressing program that causes a computer to execute a process including: extracting words from a file serving as a processing target; counting how many times each of the extracted words appears; registering bit strings each expressing, in multiple bits, the number of times of appearance into an index so as to be kept in correspondence with the words and the file; among the plurality of bit strings registered in the index while being kept in correspondence with the words and the file, each rearranging, within the bit string, bits included in a first bit string and bits included in a second bit string, so as to be in a different order; and compressing the index in which the bits have been rearranged, by using mutually-different mathematical functions.