Importance

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Abstract

A set representation system is provided that enables the operator to immediately understand set manipulation instructions and calculation results of such instructions. Sets and set groups are hierarchically organized and the hierarchical structure is displayed on the display device DP, so that set groups in the relatively upper level of the hierarchy are created as a result of logical operation on all sets or set groups belonging to the lower level of the hierarchy thereof. A graphic palette area is displayed on the display device DP, where for a plurality of sets or set group at the same level of the hierarchy, graphics having areas corresponding to their respective element counts can be drawn independently; for a plurality of sets or set groups at different levels of the hierarchy, divided graphics having area ratios corresponding to element counts in all sets or set groups belonging to the lower level of the hierarchy thereof can be drawn within the graphic associated with the set group in the relatively upper level of the hierarchy.

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First Claim