Provided is a method of controlling a vehicle, the method including: determining a driving mode based on a speed of the vehicle and a user-selected driving mode, the determining the driving mode comprising driving the vehicle using power supplied from at least one power supply source of power supply sources, the power supply sources including: 1) first and second engine generators, each configured to generate power by using turning force; 2) a battery charged by the first or second engine generator; and 3) an ultra capacitor charged by the first or second engine generator; and determining an alternative driving mode comprising switching from the at least one power supply source of the power supply sources to another power supply source of the power supply sources to drive the vehicle if a failure occurs in the at least one power supply source of power supply sources.