In order to implement and manage an optimal system in the printing business and POD market, in an image forming system which comprises a plurality of devices including at least one of an image forming device which can print data in a storage unit that can store data of a plurality of jobs including data of a first job and data of a second job which is input after the data of the first job, and a sheet processing device which can execute a sheet process for a sheet printed by the image forming device, a schedule associated with a plurality of work flows including a first work flow that includes a plurality of process steps using a plurality of devices of the image forming system required to complete the first job, and a second work flow that includes a plurality of process steps using a plurality of devices of the image forming system required to complete the second job can be set.