8. A requirement acquiring method, comprising the steps of: a) arranging components of a development on a screen of a computer terminal; b) specifying, for each of the arranged components, an attribute information relating to data and procedure to be held by said component; c) designating a procedure call sequence between the components by selecting a procedure from a list of procedures held by the component, and representing an arrow line between said arranged components holding said selected procedure on said screen; d) generating a scenario including component data and procedure call sequence data on the basis of said attribute information and said selected procedure call sequence; and e) successively displaying a procedure call sequence with arrow lines between components on said screen of said computer terminal in accordance with said generated procedure call sequence data.
12. A requirement acquiring method according to claim 8, wherein said step c) comprises specifying at least one of components other than said component holding said selected procedure, wherein said step d) comprises generating data of component on the basis of said specified components, and wherein said step e) comprises displaying a connection line between an arrow line of said procedure call sequence and said component specified as data of component.