The invention discloses a method and a system for analyzing internet data. The method includes acquiring attributes of products on the internet and comments corresponding to the products; determining first weight values corresponding to each comment for each product according to concern degree information of the comment corresponding to the product; determining second weight values of each attribute of each product according to results obtained by sediment classification on the comments corresponding to the attribute of the product; combining the first weight values corresponding to each comment and the second weight values of each attribute of each product with one another and determining data analysis results related to the comments on the products. The method and the system have the advantage that the problem of inaccurate analysis results due to the fact that comment data are analyzed by the aid of existing star rating methods only according to average values can be solved by the aid of the method and the system.