A workflow system is provided in which one person in charge efficiently processes each activity assigned to successive nodes. When a client request management program execution unit 330 of a workflow server 30 receives a request to terminate processing for a node from a user's computer terminal for operation 20, a definition for the node is referred to by a project management program execution unit 310. If processing of a process management program execution unit 320 is completed within a consecutive processing standby time t1 defined for the node, and it is determined that a next node can be processed by the user, a client request management program execution unit 330 requests a computer terminal for operation 20 to start processing of a next node.