A roadside device 200, which performs radio communication with a mobile station on a road, includes: a first communicator 210 available for a first radio communication scheme; a second communicator available 220 for a second radio communication scheme different from the first radio communication scheme; and a controller configured to acquire, from the first mobile station via the first communicator 210, information associated with a first mobile station and distribute the acquired information to a second mobile station via the second communicator 220.