A budget compilation process for executing budget compilation for a plurality of bank branch offices is executed in parallel at the same time. Process conditions (participant clients in the budget compilation process, and etc.) are inputted to an input/output control unit, and in accordance with the process conditions, a data server starts up a client to execute the budget compilation process. By referring to a scheduling file formed by a budget compilation process start-up unit, the client determines a branch office for which the budget compilation process is executed. In this manner, clients execute the budget compilation process for the subject branch offices in parallel at the same time. The execution state of the budget compilation process can be monitored on a display screen, and an operator can instruct to stop the operation of the whole network at the intermediate of the operation.