DEVICE AND METHOD FOR FILTERING INFORMATION, DEVICE AND METHOD FOR MONITORING UPDATED DOCUMENT INFORMATION AND INFORMATION STORAGE MEDIUM USED IN SAME DEVICES

The present invention is a device and method for filtering information, the device comprising a document database storing document data to be filtered, a reproduced document information storing unit storing fundamental document data used for detection of documents, newly created or updated, a detecting unit for detecting a document, newly created or updated, among document data stored in the document database based on document data stored in the document database and the fundamental document data stored in the reproduced document information storing unit, a similarity computing unit for computing a similarity between the detected document detected by the detecting unit and a retrieval condition set in advance, and a presenting unit for presenting detected documents detected by the detecting unit according to the similarities computed by the similarity computing unit.