A hot topic extraction apparatus for extracting a hot topic from
information includes an information collection unit, an information
storage unit, and a hot topic extraction unit. The information collection
unit collects a document from an information source. The information
storage unit stores collected information. The hot topic extraction unit
extracts a document from the information storage unit while the
information collection unit collects the document, and retrieves a
document from the retrieved document, thereby extracting a hot topic from
information contained in various information sources, not extracting a
hot topic from a given document.