Provided are an apparatus and method for extracting cascading style sheet (CSS) rules. The apparatus includes a generation unit configured to generate an identification list that includes identification symbols that correspond to one or more selectors, for each document object model (DOM) node. The apparatus also includes a rule extraction unit configured to select a target DOM node and extract one or more CSS rules that are applicable to the target DOM node based on identification symbols that are included in an identification list that corresponds to the target DOM node.