13. A non-transitory computer-readable storage medium storing a group of instructions executable by a computer to: construct a database that registers names of a plurality of music pieces, each name in association with at least one word representing an impression of the associated name of the respective music piece, the words being used as search words when any of the names of the music pieces is to be searched for; connect to a communication network to access any one of a plurality of sites on the communication network and collecting, from among text information being provided by the accessed site, a word usable as a music-piece-related search word in association with a name of a particular music piece, without collecting the particular music piece; and register the collected word in association with the name of the particular music piece, into the database.
15. The non-transitory computer-readable storage medium according to claim 13 , wherein: the text information comprises a sentence structure of text, the collecting step includes analyzing the sentence structure and extracting an impression word and the name of the respective music piece, and the collected word comprises the impression word.