An information-processing method usable by an information-processing apparatus is provided. The information-processing-apparatus is used for editing state-transition information usable to construct a state-transition diagram including information on the operation in each of states, information on events each possibly occurring in each specific one of the states to result in a transition, and information on transition directions each indicating the direction of a transition caused by each of the events possibly occurring in the states. The method includes searching for a hardware event not assigned yet as any one of the events, assigning a hardware are event found in a search process carried out at the searching step as a shortcut event if the events include the software event, generating the state-transition diagram on the basis of the state-transition information, and displaying the state-transition diagram.