To create a sufficiently useful and detailed index of entire audio content.
When audio content (audio data) is input and an index creation command is received, an index generation device 20 generates a speech word list from words included in text data obtained through speech recognition of the audio content, calculates speech densities from the generated speech word list, extracts words whose speech density exceeds a predetermined value as topic words per unit time, generates a topic word list enumerating the extracted topic words in association with the predetermined unit time between the speech start time and speech end time of the audio content, extracts time points without any enumerated topic words on the generated topic word list as topic change points, and generates an index by sections delimited by the extracted topic change points from the topic words enumerated in each section on the topic word list.
YOKOZEKI DAISHIRO
TAKADA SHINYA
Shiro Nakatsuji
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