Abstract: An automobile operation control system is provided, which provides a service of a fixed-time and fixed-route operation and an on-demand operation using an operation vehicle to multiple users who reside in a given geographical area. The system includes an operation control device managed by an operation administrator and comprising a processor. The device is configured to receive a boarding reservation for the the on-demand operation from a first user of the multiple users. The devices suspends, in response to an acceptance of the reservation for the on-demand operation of which a second operation time window is within a given threshold from a first operation time window of the fixed-time fixed-route operation, the fixed-time and fixed-route operation scheduled to be operated in the first operation time window, when a given condition is satisfied.