Method for inputting and acquiring requirement

On a computer, components forming a development subject are arranged on a scenario editor by using basic component parts, and the component data are set. And a procedure call sequence is defined by specifying procedures of defined components in order of call. The call sequence data is generated in the computer as scenario data. Then, the defined group of scenarios are selected and reflected on the model editor. A whole requirement is created. At that time, a procedure name to be called subsequently on the connection line between components is acquired from the defined procedure sequence data, and a program for effecting animation is generated. Finally, by executing the generated animation program, the procedure call sequence is displayed in an animation form and the requirement is created. By interactive operation alone of the screen using the scenario editor and the model editor, therefore, the requirement of the development subject from the customer can be easily acquired and the whole requirement can be created.