To improve efficiency of UI production, a UI producing apparatus includes: a UI producing unit configured to allow a user to design UI screens which correspond to contents, respectively; a multi-preview executing unit configured to generate contexts for controlling the UI screens, respectively, and configured to simultaneously display previews corresponding to the UI screens, respectively, based on the contexts; a coordination unit configured to, responding to an event generated on at least one of the UI screens, provide a message, which includes information about the event, to one of the contexts corresponding to another one of the UI screens, in order to cause the UI screens to coordinate with each other; and a screen generating unit configured to modify the one of the contexts, based on the message, so as to generate the UI screens.