12. The apparatus according to claim 1 , wherein the one or more hardware processors generate a plurality of pieces of mapping information for one keyword, and a plurality of tags for the one keyword, based on the pieces of mapping information corresponding to the one keyword.
12. The apparatus according to claim 1 , wherein the one or more hardware processors generate a plurality of pieces of mapping information for one keyword, and a plurality of tags for the one keyword, based on the pieces of mapping information corresponding to the one keyword. 14. The apparatus according to claim 12 , wherein the one or more hardware processors generate a plurality of tags each of which is enabled to be mapped to a plurality of keywords.