A setting unit (100) includes: a limitation unit (10) that limits a list of extension user interface items to be added to an existing Web system, the items being selectable by a setting person, according to a role of the setting person including affiliated post, skill, or authority of the setting person and user interface information; and an operation setting unit (14) that sets the extension user interface in which a parameter specifiable for the item selected by the setting person is limited according to the role of the setting person and the user interface information.