An information processing method includes generating a state transition diagram based on state transition information; displaying the state transition diagram; manipulating the displayed state transition diagram; updating the state transition information in accordance with how the state transition diagram has been manipulated; and storing a position of a state designated as a transition starting state by the manipulating step. When the position of the transition starting state has been specified by the manipulating step, the displaying step displays as a pointer an icon indicating that the position of the transition starting state has been specified. When a position of a transition destination state has been specified by the manipulating step, the displaying step displays a transition directed from the stored transition starting state toward the transition destination state, and the updating step updates the state transition information by adding information of the transition to the state transition information.