3. The interactive program search apparatus according to claim 2 , wherein said association-source word extracting unit is configured to extract, as the association-source word, a word having a highest occurrence frequency in the obtainment history information among the words included in the program information of the provisionally selected program.
2. The interactive program search apparatus according to claim 1 , wherein said obtaining unit is configured to further obtain an instruction to provisionally select one of the program search results displayed on said display unit, said interactive program search apparatus further comprises a provisional selection search unit configured to search out one of the programs from the program information using program information of a provisionally selected program and the obtainment history information, and determine the searched-out program to be the provisionally selected program, said association-source word extracting unit is configured to extract the association-source word, based on the obtainment history information and the program information of the provisionally selected program, and said associated word extracting unit is configured to extract the associated word associated with the association-source word in the association dictionary, from among words included in the program information of the provisionally selected program.