Dynamic microgrid was proposed in our laboratory in order to utilize distributed power sources effectively. It means that structure of microgrid is varying according to demand fluctuation. To realize the dynamic microgrid, it is indispensable to obtain both energy demand and supply and keeps balance them by using ICT based sensor network. KNIVES (Keio University Network oriented Intelligent and Versatile Energy saving System) is an ICT based supply and demand side management system that supports distributed and cooperative power control. In this study, KNIVES is introduced to actual consumers such as care facility, school and store as a platform of dynamic microgrid. Topology of the microgrid is changeable dynamically, and it is determined to conduct optimized calculation by referring energy consumption data and targeted value set measured from individual groups. This paper describes construction method of the dynamic microgrid and evaluation of feasibility and availability from a standpoint of calculation cost.