VEHICLE DRIVING SUPPORT DEVICE, VEHICLE DRIVING SUPPORT METHOD, AND VEHICLE DRIVING SUPPORT COMPUTER PROGRAM

A vehicle driving support device performs driving support of supporting a driver's driving of a host vehicle based on traffic information. The vehicle driving support device performs a first process of acquiring traffic information associated with traveling of the host vehicle as first traffic information from forward information of the host vehicle detected by a forward information detecting device, performs a second process of acquiring traffic information associated with traveling of the host vehicle out of traffic information stored in a database as second traffic information by comparing a current position of the host vehicle with map data stored in the database, and performs the driving support based on the first traffic information even when the second traffic information is acquired until a predetermined first condition is satisfied when the first traffic information has been acquired.