1. A display input device that is configured to provide settings to an image forming device on which plural functions are mounted, the plural functions including basic functions each of which is available alone and combination functions each of which is available when being combined with one of the basic functions, the display input device comprising: a display input part that is configured to display a screen and receive an operation; a storage part that is configured to store data; and a control part that is configured to control a display operation of the display input part and recognize an operation conducted on the display input part, the control part being configured to cause the display input part to display a workflow creation and registration screen for creating and registering a workflow and to receive an operation for creating and registering the workflow, the workflow being of a combination of the basic function and the combination function, the workflow including data that is indicative of a first function selected from basic functions which is to be registered, setting contents of the first function, a second function selected from combination functions which is to be registered, and setting contents of the second function and the workflow combining the basic function and the combination function, the control part being configured to cause the display input part to display a workflow management screen for calling the registered workflow and to cause the workflow management screen to receive an operation that calls the registered workflow, the control part being configured to cause, when the control part recognizes that the operation for the registration of the workflow is conducted to the display input part, the storage part to store the workflow, the control part being configured to cause, when the control part recognizes that the operation of calling the workflow is conducted to the display input part, the image forming device to execute a job pursuant to the setting contents that are indicated by the data that is included in the called workflow, wherein the control part causes the display input part to display an item selection screen for receiving a selection of setting item whose current set value is to be changed, the setting item being among setting items of the basic function that is selected at an initiation of executing the job, the control causes the display input part to receive an operation for changing the set value of the selected setting item, causes the display input device to receive an operation for causing the image forming device to execute a job of the basic function whose setting content is set through the item selection screen, and transmits, when the control part recognizes that the display input part receives the operation for causing the image forming operation to execute the job of the basic function having data that is indicative of the content of the setting item of the basic function which is set through the item selection screen, wherein a workflow creation key is provided in the item selection screen, wherein the control part causes, when the control part recognizes that an operation is conducted on the workflow creation key, the display input part to switch a display screen from the item selection screen to the workflow creation and registration screen and recognizes that the basic function whose setting item is set through the item selection screen is selected as the first function, wherein the control part causes, when the control part causes the display input part to switch the display screen from the item selection screen to the workflow creation screen, the storage part to keep on storing the setting content that is set through the item selection screen as a setting content of the first function, wherein the control part causes, when the operation is conducted on the workflow creation key, the display input part to display a combination confirmation screen to select as the workflow creation and registration screen whether a creation and registration of the workflow having a combination of the basic function selected as the first function and the combination function or a creation and registration of the workflow having the basic function that is selected as the first function alone, and causes, when then control part recognizes the selection of the creation and registration of the workflow having a combination of the basic function and the combination function, the display input device to display the workflow creation and registration screen for creating and registering the workflow having the combination of the basic function and the combination function.