1. A V2V communication-based vehicle identification apparatus comprising: a radar sensor unit sensing radar information corresponding to relative distances to object vehicles; a GPS module unit generating GPS information from GPS satellites; a V2V communication unit transmitting the generated GPS information to the object vehicles and receiving GPS information of the object vehicles from the object vehicles through vehicle to vehicle (V2V) communication; and a controller calculating probabilities that the GPS information of the object vehicles is located within reference areas, which are determined based on the sensed radar information, and identifying one or more vehicles corresponding to the radar information and the GPS information of the object vehicles based on the calculated probabilities, wherein the controller selects at least one combination of which a probability value among the calculated probabilities is larger than a reference value, and identifies one or more vehicles corresponding to the radar information and the GPS information of the selected combination.