PROBLEM TO BE SOLVED : To provide a system for judging a business plan in the future by taking pensions, held real estate and the property or debt of subsidiaries into a balance sheet or income statement, performing trial balancing of the balance sheet or income statement in the future for each kind of pension operation or real estate operation and supporting the business of an entire group enterprise.SOLUTION : This company business improvement system is composed of a process for inputting the result data of the balance sheet and the income statement to a computer, process for inputting result data on pension management, process for inputting result data on real estate management, process for inputting a business (benefit) plan as data, input process for a facility investment plan, trial prediction (simulation) data balancing process for calculating the balance sheet and the income statement in the future in the case of promoting the business (benefit) plan on the basis of the result data for each selected simulation by the computer, storage and management process for the prediction data, and output process for the prediction data.