A method and system for displaying a keyword advertisement through retrieval of an optimal landing page associated with a detailed keyword, and displaying the retrieved landing page for a user, instead of displaying a non-specific landing page associated with the advertisement keyword included in the detailed keyword. A method of displaying a keyword advertisement includes: receiving from a user a detailed keyword that includes one or more advertisement keywords purchased by an advertiser and character strings; dynamically retrieving a landing page according to the received detailed keyword; and displaying page information of the landing page for the user.