Off-road driving assistance device and method

An off-road driving assistance device may include: a receiver configured to receive driving information of a vehicle; a first controller configured to determine a stuck state probability score based on the driving information; and a second controller configured to control a magnitude of a driving torque or a braking torque based on the driving information and the stuck state probability score. The second controller may be configured to adjust a change in slope of the driving torque or the braking torque based on the stuck state probability score and control the magnitude of the driving torque or the braking torque.