A method for electronic commerce including generating a host ID and a POD ID at a receiving device; transmitting purchase information on a product, the host ID and the POD ID to a service provider to request purchase of the product; determining whether the requested purchase is approved at the service provider by evaluation of the validity of the transmitted host ID and POD ID; and receiving information on whether the requested purchase is approvided or not at the receiving device. Accordingly, the method for electronic commerce has high security and is convenient to use.