A method of processing a commerce service in a commerce processor communicating with a customer premises equipment (CPE), the method including executing a first browser and outputting a coordinate corresponding to a bitmap associated with inputted payment data on a screen of the first browser, receiving coordinate values corresponding to payment data through the output coordinate, transmitting the received coordinate values based on a communication protocol to a second browser, unscrambling the transmitted coordinate values corresponding to the payment data and retrieving payment data from the unscrambled coordinate values, and performing a payment process for a product item corresponding to the retrieved payment data.