A communication device for a platooning vehicle is provided and includes a communication circuit; a memory; and a control circuit electrically connected with the communication circuit and the memory. The control circuit transmits, via the communication circuit, platooning information to another platooning vehicle in the platooning group when platooning is initiated and receives, via the communication circuit, information from an outside vehicle that is not part of the platooning group, the information including identification information of the outside vehicle. The information from the outside vehicle is processed when the identification information of the outside vehicle matches identification information of the other platooning vehicle, the identification information of the other platooning vehicle previously stored in a memory of the other platooning vehicle. The information receiving from the outside vehicle is stopped when the identification information of the outside vehicle does not match the identification information of the other platooning vehicle.