It is an object to provide a technique which enables shortening of design time and facilitation of a design work for implementing a display of a state transition animation. A user interface apparatus includes an event processing storage which stores a state transition of display state and an event processing being associated with each other and processing circuitry which executes an event processing in accordance with an input operation received by a receiver and also executes, on a display, a state transition associated with the event processing to be executed. In a case of executing the state transition, the execution unit creates an animation display component which defines a display state using a state transition animation, and on the way of the state transition, executes the animation display component, to thereby display the state transition animation on the display.