An antenna device includes: a substrate; a wave antenna, disposed on one surface of the substrate, for transmitting and receiving data to and from an external vehicle or a base station; a GPS antenna disposed on one surface of the substrate; a WiFi antenna, disposed on the other surface of the substrate, for transmitting, to a head unit, data that the wave antenna has received, and transmitting, to the wave antenna, data that has been received from the head unit; and a system module for receiving a signal from at least any one of the wave antenna, the GPS antenna or the WiFi antenna and controlling the same.