PURPOSE: To improve the data processing efficiency by excecuting the schedule processing to the reinput of a DD/D control list when the update of DD/D is carried out by a system after the execution of said update is recorded.

CONSTITUTION: A control list controlling part 10 contains a reinput schedule part 31, a rereading processing part 32 and a composite system expanding part 33. The part 31 performs the schedule processing by a schedule request signal sent from a system at an end part based on the DD/D update. The part 32 gives an access to the DD/D and checks whether the reinput is scheduled when said access is requested. If the reinput is scheduled, the control list of the DD/D is read again and written to a memory. The part 33 gives a schedule request to all systems which are capable of communication with the inter-system communication procedure, etc. and requests the rereading of the DD/D. Then the part 33 confirms that all other systems are through with their schedules.