COMPUTER APPARATUS, COMPUTER PROGRAM AND METHOD, FOR CALCULATING IMPORTANCE OF ELECTRONIC DOCUMENT ON COMPUTER NETWORK, BASED ON COMMENTS ON ELECTRONIC DOCUMENT INCLUDED IN ANOTHER ELECTRONIC DOCUMENT ASSOCIATED WITH FORMER ELECTRONIC DOCUMENT

A computer program, method and computer apparatus for calculating the total importance of an electronic document on the basis of (i) a plurality of electronic documents chained to each other in a relation of referencing and being referenced, from a start electronic document which is not referenced by other electronic documents to a terminal electronic document which does not reference other documents, (ii) the information on relation of referencing and being referenced, (iii) an important phrase, and (iv) a response coefficient determining phrase such as an agreeing phrase, a disagreeing phrase, and a topic change phrase, (i) through (iv) being stored in a storage device.