14. The non-transitory computer-readable recording medium according to claim 1 , wherein the encoding includes encoding a plurality of text files that are input to the computer and are associated with each other to a plurality of encoded files by using a static dictionary and a dynamic dictionary, the dynamic dictionary being generated in accordance with word appearance frequencies in the plurality of text files.
1. A non-transitory computer-readable recording medium having stored therein an encoding program that causes a computer to execute a process comprising: encoding a plurality of text files that are input to the computer to a plurality of encoded files by using a static dictionary and a dynamic dictionary, the dynamic dictionary being generated in accordance with word appearance frequencies in the plurality of text files; and generating a coupled encoded file that includes the plurality of encoded files, information on the dynamic dictionary, and position information that indicates a position of each of the plurality of encoded files.