A vehicle driving guiding device includes a plural of light emitting sections each that is provided, respectively, inside plural grills of air-vents which are arranged in front side of interior space of the vehicle and emits light to the interior space of the vehicle through the grills of the air-vents, and a controller for controlling a left-light emitting section provided on a left side of the light emitting section to emit light in case of a left direction indication signal and for controlling a right-light emitting section provided on a right side of the light emitting section to emit light in case of a right direction indication signal when road guiding direction indication signal is produced. A method is also described.