Abstract: A district assisting system for making a plan of a waste disposal network, Icons (I1 to I3) indicating the kinds of waste are displayed on a monitor screen. The operator selects, e.g., a gasification melting furnace from a disposal facility item box (W2), creates an icon (I4) in a plan sheet box (W1), and draw a line (L1) linking the icon (I1) to the icon (I4). When the operator clicks the icon (I4), the kinds and amounts of residual and valuable substances produced when combustible waste is processed in a gasification melting furnace are displayed. The operator selects the next disposal facility according to the displayed unconnected residual substances, creates an icon of the selected facility on the monitor screen, and links the icon to the icon (I4). Thus a plan is completed.