High Throughput Satellite (HTS), which has large communication capacity, is being developed to meet the rising demand for satellite communication system at the time of disaster. However, HTS adopts static frequency resource allocation, hence it is difficult to effectively utilize frequency resources. Therefore, many technologies for effectively utilizing frequency resources have been developed. However, the effectiveness of such technologies was not revealed clearly, because there was no quantitative evaluation method to measure their effectiveness. To create such method of evaluation, it is essential to consider the flexibility of frequency resource allocation. Thus, the construction of an evaluation method for flexibility is an important research issue. Therefore, in this research, we aim to construct a system analysis model to measure the effectiveness of frequency flexibility of satellite communication systems. Furthermore, we evaluate the effectiveness of frequency flexibilization technologies and quantitatively show the validity of such technologies.