DRIVE ASSISTANCE DEVICE AND COMPUTER PROGRAM

Provided is a drive assistance device preventing an unrecommended lane when a vehicle travels, enabling appropriate provision of driving assistance. Specifically, candidates for a way of moving into a selectable lane when the vehicle moves along a planned travel route are identified and obtained by using map information. Then, for a candidate that involves a lane change among the obtained candidates for a way of moving into a lane, a lane change start location at which a lane change starts and a lane change end location at which the lane change ends are set at a location close to a destination on a priority basis, and manner of moving into a lane for the vehicle that is recommended when the vehicle moves is selected from among the candidates for a way of moving into a lane, taking into account the set lane change start location and lane change end location.