The mission of Nakajima Laboratory is to bring the power of medical computation servers and surgical assistance systems into clinical settings. The methods developed by our group can provide artificial-intelligence (AI)-based integration of multi-modal medical data. These technologies provide intelligence that is useful to analyse, simulate, plan and assist surgeries. In addition, we have developed an internet-of-things (IoT) platform that can integrate such AI computers with sensors and surgical robots. These developments can truly lead the computerization of medicine. Our systems have been introduced into practical surgery routines in several hospitals. They have reported using our systems in more than 200 successful clinical cases.