The present invention aims at extracting a keyword of conversation without preparations by advanced anticipation of keywords of conversation. A keyword extracting device of the present invention includes an audio input section 101 by way of which a speech sound made by a speaker is input; a speech segment determination section 102 that determines a speech segment for each speaker in connection with the input speech sound; a speech recognition section 103 that recognizes a speech sound of the determined speech segment for each speaker; an interrupt detection section 104 that detects a feature of a speech response suggesting presence of a keyword on the basis of a response of another speaker to speech sounds of respective speakers; namely, an interrupt where a preceding speech and a subsequent speech overlap; a keyword extraction section 105 that extracts the keyword from the speech in the speech segment specified on the basis of an interrupt; a keyword search section 106 that performs keyword search by means of the keyword; and a display section 107 that displays a result of keyword search.