As a marvelous predicting and estimating methodology for the Heat Island in an urban area, Architecture-Urban-Soil Simultaneous Simulation Model, AUSSSM was entirely established. The revised AUSSSM is evolved from the former proposed AUSSSM by not only replacing but also newly adding several sub-models. Each sub-model expresses complex phenomenon such as one-dimensional vertical distribution of air temperature, wind velocity and humidity ratio in urban canopy, artificial heat generation from buildings and traffic, evapotranspiration from vegetation, transient evaporation from artificial surfaces shortly after precipitation, dynamic performance of cooling load and HVAC system in buildings. These sub-models have been developed in authors' former works. One of the most important features of AUSSSM is the fact that each sub-model has relatively same level of its accuracy, which leads practically correct and significant solution under the constraint of limited computational resource. And following theoretical description, the Standard Solution assuming a business district in Tokyo was presented.