| 摘要 |
PROBLEM TO BE SOLVED: To reduce or reduce to a minimum necessary the capacity of a database by previously narrowing an all-station and all-period database as a reproduction candidate database using a video record list of a video recorder.SOLUTION: A video record list 301 is acquired from a video recorder 30 and used to reconstitute in a memory 109 a database consisting of only reproduction candidates from the all-station and all-period database. If a sound feature amount from an investigation target television set 20 does not match that from the reception tuner 101 of a contact investigation apparatus 10 in realtime determination processing, check with the sound feature amount of the database consisting of only the reproduction candidates is performed. |
