12. The method according to claim 10 , 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.
10. A computer-implemented method for constructing a database, the method comprising: a step of providing a storage device storing 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 names of the music pieces is to be searched for; a collection step of connecting 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 a step of registering the word, collected in the collection step, in association with the name of the particular music piece, into the database.