9. The apparatus according to claim 7 , wherein the extraction unit is configured to extract, from the estimated value distributions, a start time and an end time of a zone of the video content corresponding to one of the estimated value distributions which is upwardly convex.
7. The apparatus according to claim 1 , wherein the second acquisition unit is configured to acquire the estimated value of each of the words, based on a character string length of the comment which contains each of the words, and number of words included in the comment which contains each of the words.