PURPOSE: To achieve a stress evaluation efficiently on all stress lines of an analysis model by including an automatically stress line generating means and a stress evaluation means.

CONSTITUTION: Identification number and analysis condition 001 of material to be used are read in. Then, data of analysis conditions and allowable stress values or the like 002 for each material identification number, a correspondence list 004 between element number and the material identification number, node number and coordinate values 005 thereof, the element number and connectivity 006 thereof and results 007 of structural analysis are read in. A stress line is generated 6-2 automatically and a development of the results of axially symmetrical analysis is performed to the results of three-dimensional analysis as required. Finally, a stress evaluation 6-4-1 is accomplished. A file 009 of the results of the stress evaluation is generated through an output device 7. A contour line chart of the results of the stress evaluation of various scales are displayed on an analysis model. Moreover, a physical property value data used for the analysis is subjected to a processing of plotting 9.