Finally, we observe in scenario 2 that the impact of the network neutrality regulations in accordance with the variation of the timing of regulation introduction is greatly reduced after a certain period. The greatest advantage of next generation access network is the support of newly developed applications, and it could be difficult without network neutrality regulation of government. However, network neutrality may not be performed effectively if done by ex post regulation. Hence, government should judge the necessity for network neutrality and appropriate direction, and conduct regulation as early as possible, in order to maximize the effects of the regulations.