PROBLEM TO BE SOLVED: To provide a system to be easily handled by anyone and capable of constructing business strategy.SOLUTION: Internal environment information and external environment information are respectively displayed on an internal environment display area and an externalenvironment display area, an internal environment sWOT input area and an external environment SWOT input area formed correspondingly to respective display areas aredisplayed, the inputs of internal environment sWOT information and external environment SWOT information are respectively received in both the areas, and the inputted internalenvironment SWOT information and external environment SWOT information are displayed in respective list display areas. Then one of the internal environment SWOTinformation and one of the external environment SWOT information are respectively selected and received from the listed information, the selected state of the selectedinformation is displayed, and an input area of a strategy target corresponding to the selected intermal environment SWOT information and external environment SWOTinformation is displayed to receive the input of strategy target information.