A work vehicle includes travelling work state detection sensors to detect a travelling work state of the work vehicle to output detected signals indicating the traveling work state. Circuitry is configured to determine that an early abnormality occurs when the detected signals satisfy a first condition, the work vehicle being in an early stage of trouble in travelling due to the early abnormality. The circuitry is configured to determine that an actual abnormality occurs when the detected signals satisfy a second condition which has a second threshold severer than a first threshold of the first condition, the work vehicle being in trouble in travelling due to the actual abnormality. The circuitry is configured to provides notifications of the early abnormality and the actual abnormality toward an outside of the work vehicle when it is determined that the early abnormality and the actual abnormality occurs, respectively.