REQUIREMENT STRUCTURE DISPLAY DEVICE AND PROGRAM

PROBLEM TO BE SOLVED: To display a flow of refinement of a part of interest in an easy-to-see state even the number of requirements is very large.SOLUTION: A requirement structure storage part 10 stores requirement structure information representing a flow of refinement of a requirement into one or more requirements based upon a refinement manner with a graph structure which includes the requirement and manner as nodes and parent-child relation between the requirement and manner as an edge. A graph display generation part 22 generates graph display information representing the graph structure, represented with the requirement structure information, as an image. When a user selects a node on a display of the graph display information, an interest part display generation part 24 displays interest part display information having the node displayed in the center and nodes of the parent and child of the node displayed above and below respectively. The interest part display information represents a flow showing how an interest node derives from which node to which node.