A processor of a route providing device provided in a server according to an embodiment of the present invention: at the time of entry into a cruise control mode for causing a vehicle to travel at a speed configured by a user, causes the vehicle to travel at the configured speed in a first lane in which the vehicle is current travelling; and, when another vehicle, which is travelling at a speed slower than the configured speed in front of the vehicle, is sensed through a sensor provided in the vehicle, controls the vehicle in a preconfigured manner.