In a document processing system, whether processing of a workflow specified by a cancellation instruction is in execution is determined based on whether identification information of the workflow specified by the cancellation instruction coincides with that of a workflow associated with document data. When the processing of the workflow corresponding to the cancellation instruction is in execution, the processing of the workflow is canceled. When the processing of the workflow is not in execution and the contents of processing to be executed by another image forming apparatus are designated in a selected workflow, the cancellation instruction is transmitted to the other image forming apparatus specified based on the log information.