This invention provides an image processing system and information processing apparatus, which can improve user's operability upon execution of a workflow without causing any productivity or reliability drop, and control methods thereof. To accomplish this, an information processing apparatus included in this image processing system receives digital data of a document read by an image processing apparatus, specifies feature information of the received digital data, and executes matching between the specified feature information and a plurality of templates. The information processing apparatus acquires a processing status of a workflow which is being currently executed from a workflow server. When a process indicated by attribute information of a template whose matching has succeeded matches a process indicated by the acquired processing status, the information processing apparatus registers the digital data in a document server as a document.