An inconsistency-determining apparatus in an emergency notification system in which emergency information about a vehicle accident is able to be transmitted from each of the vehicles that have accidents includes an acquisition unit configured to acquire information about a number of times each of the vehicles collides or information with which the number of times is able to be specified, as emergency information about the vehicles that have the accidents, a counter configured to count the number of times each of the vehicles that have the accidents collides, a comparator configured to compare the number of times one of the vehicles that have the accidents collides with that of another thereof, and a generation unit configured to generate an inconsistency comparison result representing a possibility that an unknown vehicle having a collision exists when there is inconsistency in the number of times the vehicles that have the accidents collide.