A graphics map of an area in which a system is set is displayed on a screen
of a display unit, and minimized stations and line connecting between the
stations are displayed on the map. Display colors of the station icon and
the line icon are changed in accordance with presence/absence of a
failure. When each station icon is clicked, a window showing a list of
NODEs belonging to that station is opened, and a NODE having a failure and
a NODE having no failure are also distinguished from each other by
changing the display colors in this window.
