A map generation system includes a vehicle including a terminal, an input data compilation device, and an output data compilation device. The input data compilation device includes a data reception unit, a data accumulation unit, and a current state map data creation unit. The data reception unit communicates with a communication unit of the terminal. The data accumulation unit accumulates data held by the terminal. The current state map data creation unit creates current state map data using data accumulated by the data accumulation unit, and map data, regional data, or both. The output data compilation device includes a forward region calculation unit and a calculation transmission unit. The forward region calculation unit makes predictive calculation of a forward region of the vehicle, using the current state map data. The calculation transmission unit communicates with the communication unit regarding a result of the predictive calculation.