3. The information processing apparatus according to claim 2 , further comprising: a position information extractor for extracting position information indicating a position, in said time series, of said keyword to be replaced with said added ID information by said description information conversion means, wherein said storage means further stores said position information extracted by said position information extractor.
3. The information processing apparatus according to claim 2 , further comprising: a position information extractor for extracting position information indicating a position, in said time series, of said keyword to be replaced with said added ID information by said description information conversion means, wherein said storage means further stores said position information extracted by said position information extractor. 4. The information processing apparatus according to claim 3 , wherein said list producing portion adds said position information extracted by said position information extractor to said list in such a fashion that said position information is correlated with the keyword.