Current internet has not experienced ideal development. Various issues were solved in the historical situation and power politics. As same as the difficulty in changing government organization and system, it is difficult to change the structure of the established Internet (and internet); however I believe the Internet (and internet), which is going to be more and more complex, must be simplified in some chance. Development of network virtualization will probably make a good chance. Therefore, I re-categorize some of my research into a theme named "rebuilding the Internet".