https://qooah.com/2013/07/04/softbank-%e6%8e%a8%e5%87%ba%e5%85%a8%e7%90%83%e6%9c%80%e8%bc%95%e9%98%b2%e6%b0%b4%e9%98%b2%e5%a1%b5%e6%99%ba%e8%83%bd%e6%89%8b%e6%a9%9f/