INFORMATION EXTRACTION SERVER, INFORMATION EXTRACTION CLIENT, INFORMATION EXTRACTION METHOD, AND INFORMATION EXTRACTION PROGRAM

PROBLEM TO BE SOLVED: To provide an information extraction server capable of extracting information that a user is interested in from a text.SOLUTION: An information extraction server gathers a text in which an interest keyword appears, the interest keyword, and the creation time of the text, extracts a keyword, except the interest keyword, included in the text and the creation time, extracts, as a local hot word, a keyword such that a time score found from the appearance frequency of the keyword in an appearance period exceeds a first threshold and a local score found from the appearance frequency of the keyword in a predetermined local area exceeds a second threshold, extracts the appearance period of the extracted keyword and the interest keyword corresponding to the keyword, and stores the extracted local hot word, appearance period, and interest keyword.