JPH05250127

PURPOSE:To easily confirm the setting of the screen switching by displaying the screen switching mode in a tree structure based on the jumping destination information which is set for each operating touch switch of plural switching display screens. CONSTITUTION:The jumping destination of the first display pattern is decided based on each jumping destination information included in the attribute set for each operating switch (S100, S110). Such a deciding operation is carried out for each display pattern so that the jumping destination information of each display pattern is decided (S120, S130, S100, S110). When the jumping destination information of all display patterns are decided (S120), it is decided whether each display pattern includes or not one or more pairs of the jump input (return) and the jump output (jumping destination) given from another display pattern (S140). If an abnormal state is detected, the tree structure screen corresponding to the jumping and return destinations of each display pattern is shown on the display screen of an external computer together with the abnormal state.