A method for enhancing association rules includes: performing an association rule algorithm to establish a list of established association rules, wherein the list of established association rules includes at least one antecedent item set, at least one consequent item set and at least one original confidence; performing minimization of a cost function to obtain vector(s) of the at least one antecedent item set and vector(s) of the at least one consequent item set according to the list of established association rules, wherein the vector(s) of the at least one antecedent item set and the vector(s) of the at least one consequent item set correspond to the at least one antecedent item set and the at least one consequent item set; and establishing an enhanced association list according to the vector(s) of the at least one antecedent item set and the vector(s) of the at least one consequent item set.