DRIVE ASSIST DEVICE AND METHOD, COLLISION PREDICTION DEVICE AND METHOD, AND ALERTING DEVICE AND METHOD

A drive assist device includes: an approach degree calculator configured to calculate a first approach degree of a vehicle to an object in a vehicle traveling direction and to calculate a second approach degree of the vehicle to the object in a direction that intersects the vehicle traveling direction based on a relative velocity between the vehicle and the object; and a drive assist control unit configured to control execution of drive assist based on the first approach degree and the second approach degree.