PURPOSE: To facilitate also the addition of a new graph processing function and a new setting item by enabling the delicate setting for the set item of each graph even if the processing of an interactive edition function is not incorporated for every graph.

CONSTITUTION: A menu preparation part 2 has an interactive edition function, inquires of either one of first to third graph generation parts 3 to 5 as to set items which are possible to be set/changed when the setting/change of the set item defining a graph is requested by an information input part 1, and prepares the menu for the setting/change by the interactive edition of the set items based on the information on the set items which are possible to be set/changed to be returned from the first to third graph generation parts 3 to 5 according to this inquiry.