PURPOSE: To easily display present conditions by previously giving spatial and hourly attributes to a task domain, storing them in a file and fetching the task domain which is interactively instructed from the file to display it.

CONSTITUTION: An attribute 2-1 is given to the task domain 2 and it is previously registered in the file 1. A related task domain judgement part 3-1 detects the other task domain 2 which has more than prescribed rate of the attribute 2-1 common to the attribute of the task domain 2 which is interactively instructed and which does not have the exclusive attribute 2-1 so as to display it. When the exclusive task domain 2 as against the task domain 2 selected among the displayed task domains 2 is displayed, it is erased. Thus, display related to the other task domain 2 which does not have the common attribute 2-1 is repeated. Thus, the present conditions are easily displayed and the selection of the next task domain can be supported.