The present invention provides a vehicle driving assistance device, including: a collecting unit which collects vehicle safety information including positional information of a vehicle; a determining unit which determines a kind of driving road on which the vehicle is driven using the positional information; and a control unit which activates at least one driving assistance function related with the kind of driving road, among a plurality of driving assistance functions which is implemented in the vehicle and an automatic activating method of a vehicle driving assistance function by the vehicle driving assistance device.