18. The method as set forth in claim 16 , further comprising: displaying on the screen, as a search word candidate, a word that is included in both the acquired trending word and the acquired attention word.
16. The method as set forth in claim 13 , further comprising: extracting words from the electronic program guide and acquiring, as an attention word, a word for which an appearance frequency in a second period, following a first period, has increased beyond the appearance frequency in the first period; displaying on a screen, as a search word candidate, a word obtained by causing the acquired attention word to operate on the acquired trending word; receiving a selection input for a search word by the user; and retrieving from the program information database program information that includes the search word selected by the user.