Abstract
In this paper, We present system written in dialogue that even an ordinary person can measure economic impacts which are derived from public investment. The features of this new system are following two respects: In the first place, Everybody can measure economic impacts by interregional input-output analysis which could not analysis in any prefectures so far. And then, can measure it automatically as long as set total cost by habing database of input component ratio for public investment. Everybody can measure economic impacts by using this system in short time, and besides, can measure it minutely.