The invention is a travel support system using notified non-equipped vehicle information, and including an equipped-vehicle detecting unit detecting a presence and a position of an vehicle equipped with a communication module for communicating with another vehicle, a non-equipped-vehicle detecting unit detecting a presence and a position of a non-equipped vehicle without any communication module, and an information-holding vehicle identifying unit identifying an information-holding vehicle that is the equipped vehicle and holding non-equipped-vehicle information including the position of the non-equipped vehicle, based on the position of the equipped vehicle and the position of the non-equipped vehicle. The system also includes a non-equipped-vehicle information providing unit providing the non-equipped-vehicle information for the identified information-holding vehicle, and a communicating unit holding the provided non-equipped-vehicle information and providing the held non-equipped-vehicle information for another equipped vehicle via the communication module of the identified vehicle.