A system and method for monitoring a gas station can be used to prevent deceptive practices, such as a gas station that deceives a refueling amount or supplies inferior fuel. The gas station monitoring system includes: at least one telematics terminal that collects refueling information and transmits the refueling information to the outside; a credit card company server that transmits payment information of a gas station to the outside; a traffic information providing server that transmits traffic information including a position of the gas station to the outside; and a telematics server that determines the gas station to be a dishonest gas station that deceives a refueling amount by comparing information that is transmitted from the at least one telematics terminal and the payment information.