This study aims to develop a program that can predict the annual generation of BIPV system (Building Integrated Photovoltaic system) installed on the outer wall of buildings more realistically. The BIPV system causes a difference in the amount of solar radiation incident on the PV panel depending not only on the amount of solar radiation in the particular site where the building is constructed but also on the incense that the outer wall of the specific building faces. Especially, even if the exterior walls have the same incense, there is a remarkable difference in the amount of solar radiation depending on the installation position due to the influence of the solar radiation shielding by the surrounding buildings. In order to confirm this difference, it is necessary to analyze the annual solar radiation dose at a specific time interval and to sum up the amount of solar radiation incident at the relevant time to predict a realistic solar radiation environment of a BIPV panel. This will determine whether or not to install BIPV in actual buildings according to the amount of power generated by each part of the building, so that the most advantageous location can be selected and efficient planning can be made. In this study, we verified the suitability of the equation of solar radiation forecasting to the domestic situation through empirical tests and developed a prediction program using the proven formula. The program can estimate the actual annual radiation dose considering the sunshine environment for a certain area and the location of the exterior wall of a specific building at the time. The developed program is designed to calculate the energy cost using the prediction result of generated power, and to make economic analysis through life cycle cost calculation (LCC). This program can easily provide the judgment data that can grasp the effect and economical efficiency according to the optimum application position and application scale when planning the BIPV.