In an information processor, a first acquirer acquires, when a first vehicle is traveling on a first road toward an intersection and a second vehicle is traveling on a second road, which intersects the first road, toward the intersection, a traveling tendency of the first vehicle from a first storage unit storing the traveling tendency at an intersection of each of multiple vehicles. A second acquirer acquires, when the first vehicle is traveling on the first road toward the intersection and the second vehicle is traveling on the second road toward the intersection, riskiness of the intersection from a second storage unit storing the riskiness of each of multiple intersections. Based on the traveling tendency of the first vehicle and the riskiness of the intersection, a judgment unit judges whether or not there is caution information at the time of passing through the intersection.