A travelled-route selecting apparatus includes a first route selecting unit to select, from travelled routes of other vehicles generated by a route generating unit, one or more travelled routes. The one or more travelled routes each have a relative distance relative to an own vehicle equal to or lower than a predetermined threshold value. The travelled-route selecting apparatus includes a second route selecting unit to select, from the travelled routes selected by the first route selecting unit, a travelled route corresponding to a selected other vehicle. The selected other vehicle is the closest to the own vehicle among the other vehicles corresponding to the travelled routes selected by the first route selecting unit.