On a vehicle traveling on a downward slope, a driver's intentional checking is erroneously determined to be distracted driving, thus generating an alert. An apparatus includes an image data obtaining unit that obtains image data about a driver, a distracted driving determiner that determines distracted driving based on a face orientation and gaze of the driver captured in the image data and a determination criterion, a traveling state obtaining unit that obtains traveling state data about the vehicle, a traveling state determiner that determines whether the vehicle is traveling downward based on the traveling state data, and a criterion changer that changes, when the vehicle is determined to be traveling downward, the determination criterion for an upward face orientation and the gaze of the driver from a value used when the vehicle is determined not to be traveling downward.