We have proposed a simulation method of fault rupture process and generation of seismic waves at the same time using a three dimensional nonlinear finite element method. However, since there were neither pre-processor nor post-processor, long time and special knowledge were required to create input dataset in order to analyze a fault rupture process. To solve this inconvenience, we developed input and output processing systems using on-line CGI and Java. To achieve the purpose, we perfomed parametric study to determine default values for the constitutive relationship of the 3-D joint element. Thereby, shortening of the time taken at the time of data creation of an analysis model was realized and people without special knowledge also can create a model easily, and perform a simulation.