To provide a self-restoration type life plan simulation system which easily reflects the settlement and revision of many taxation systems and public security systems relating to the calculation of a cash flow, etc., on a calculation expression timely when a life plan is generated and checked.

Data for simulation of an object person are inputted, and whether data kinds for input are excessive or deficient and the necessity of the new generation or correction of a calculation mathematical expression for a taxation or social security system are determined, and the revision day of a self-restoration type life plan simulation file and the name of the revising person are changed and sent to a host computer. Then it is confirmed whether the revision contents are correct or not and when so, the file is stored on a host computer as a general file, but when not, the file is discarded. The calculation expression of a life plan simulation table is updated each time the calculation is carried out.