To provide a travel support system providing weather information at a proper timing by setting a domain for acquiring the weather information based on a characteristic of a traveling road by a vehicle or a characteristic of the vehicle itself.

A domain setting part for setting an acquisition domain for acquiring the weather information sets the acquisition domain by using at least one or more of a road attribute showing whether or not a traveling road 51 along with the vehicle 11 is traveling is a road having few connections to branched roads 52, 53 such as a highway or a road in a depopulated area, existence of equipment of the vehicle 11 for heightening traveling property in a bad weather, and vehicle information such as a vehicle model or a minimum ground clearance of the vehicle 11. Hereby, when various weather information is included on a course of the vehicle 11, weather information is provided early corresponding to the attribute of the traveling road 51, and providing of unnecessary weather information is restricted corresponding to equipment of the vehicle 11 or the characteristic of the vehicle.