An on-vehicle interface apparatus includes a touch screen and an I/F controller. The I/F controller stores a first message and a second message having a lower urgency level in association with respective events. The I/F controller displays operation switches including operation switches regarding traveling of a vehicle irrespectively of the events on the touch screen, and, in response to occurrence of an event, displays a corresponding message on the touch screen. The I/F controller, in response to detection of a touch operation on a display region of the first message during display of the first message, outputs to the vehicle controller a signal that instructs execution of the driving control corresponding to the first message.