A method and system for extracting a weight classified by a ranking which can calculate, in a keyword advertisement, a unit sale cost of an advertisement area exposing advertisement information by considering an advertising effect classified by a keyword, the advertising effect being acquired by using the corresponding advertisement area, is provided. The method of extracting a weight classified by a ranking includes the steps of: generating the advertisement area, wherein one keyword corresponds to a plurality of advertisement areas and each of the plurality of advertisement areas corresponds to the ranking; and extracting a weight value for advertising costs of the advertisement area by considering an advertising effect classified by the ranking of the advertisement area corresponding to a click-through rate (CTR), and the ranking.