The present invention produces class-specific key words from a document set. In particular, an importance of a word is defined to take into account the number of documents in a corresponding class. A class may be for example, a class of author. An importance value of a word is based on a ratio of the...http://www.google.fr/patents/US6836772?utm_source=gb-gplus-shareBrevet US6836772 - Key word deriving device, key word deriving method, and storage medium containing key word deriving program
Key word deriving device, key word deriving method, and storage medium ...
