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.
10. A requirement acquiring method according to claim 8, wherein said step c) comprises specifying at least one of data item names held by the component holding said selected procedure, and inputting a value corresponding to said specified data item, wherein said step d) comprises generating substitution data on the basis of said specified data item and said inputted value, and generating a component holding said specified data item as data of the component, and wherein said step e) comprises displaying, in a component holding said specified data item, said inputted value and displaying a connection line between said arrow line of said procedure call sequence and said component, in accordance with said procedure call sequence data.