A probability acquisition unit reads a collision probability that a pedestrian collides against a self-vehicle, from a data map, in which positions of a pedestrian are beforehand associated with collision probabilities, with reference to an obtained position of a pedestrian around a self-vehicle. This relay device can receive an en bloc paging request wherein paging requests to plural subordinate mobile communication terminals are aggregated, reconstruct the received en bloc paging request, and transmit the paging requests to each of the mobile communication terminals subordinate to itself. According to the printer, reduction of print productivity can be restricted while reducing noises and feed failures.