An image processing apparatus includes a flow execution unit configured to receive, in response to an instruction from a user to start an application installed in the image processing apparatus, a request to register a flow from the application; store information for identifying functions included in the flow and an execution order of the functions; switchably display setting screens for the respective functions included in the flow in response to a request from the application to execute the flow; and execute the functions identified based on the stored information in the stored execution order based on setting information input on the setting screens for the respective functions.