These words are displayed as ???topic words??? in FIG. 2. [0021] Next, at the client 11, users evaluate or process the summary (summary of the set of key documents) from the server 13, and the client 11 transmits it to the target server 14 via the network 12. [0022] In the evaluation or the processing performed by users at the client, users for example remove words which are not deemed to be relev