3. The method for providing article information of claim 1 further comprising: obtaining information of at least one social network joined by the present client, wherein the social network comprises a plurality of social-network-member clients, the social network comprises a social network database; when at least one of the social-network-member clients performs an external search to the external database, recording the result of the external search in the social network database; and obtaining the number of search results of the potential keywords from the social network database.
1. A method for providing article information comprising: (a) receiving an article request for obtaining an article to be read through a network from a present client; (b) analyzing the article to obtain a plurality of potential keywords from the article; (c) searching an internal database to obtain at least one representative keyword, which the potential keywords belong to, and transformation information between the at least one representative keyword and each potential keyword; (d) obtaining a number of search results of the at least one representative keyword by searching for the at least one representative keyword in an external database; (e) calculating a number of search results of each potential keyword according to the number of search results of the at least one representative keyword and the transformation information of each potential keyword respectively, wherein the transformation information is the ratio of the number of search results of the potential keyword to the number of search results of its representative keyword; (f) generating article-related information related to the article according to the numbers of search results of the potential keywords; and (g) combining the article with the article-related information to generate a web page, and transmitting the web page to the present client through the network, wherein step (f) further comprises: combining the potential keywords to generate a plurality of potential keyword sets; calculating a word-relation parameter of each potential keyword set according to the number of search results of the potential keywords, wherein the word-relation parameter of each potential keyword set is a relation weight between the potential keywords of the same potential keyword set; selecting one of the potential keywords for representing the article according to the word-relation parameters of the potential keyword sets; and searching the external database utilizing the selected keyword for representing the article to obtain the article-related information related to the article.