A combine including: a measurement sensor that measures a retention volume amount of a grain retained in a grain tank; a determination unit that determines whether or not the retention volume amount measured by the measurement sensor exceeds a preset threshold; a notification unit that, if it is determined by the determination unit that the retention volume amount exceeds the threshold, notifies an operator of information indicating that the amount of the grain exceeds the threshold; a change unit that can change the threshold; and a communication unit that communicates with an external server. The change unit changes the threshold based on data received from the external server.
