An apparatus for outputting platooning information by a platooning vehicle in a platooning group may include: one or more lamps configured to project light onto a road; a communication circuit; a controller configured to control a platooning operation of the vehicle; and a control circuit electrically connected with the one or more lamps, the communication circuit, and the controller. The control circuit may be configured to: control the one or more lamps so as to output on the road a distance range between the platooning vehicle and an outside vehicle that is not part of the platooning group when a request from the outside vehicle to join the platooning group is approved by the platooning vehicle or a leading vehicle of the platooning group. The distance range may be a distance required to join the platooning group.