This paper is a study for design restriction of UOC(Ubiquitous computing On Chip) technology using the technology concept of M2M/IoT/WoT. At first, this paper discovers the characteristics of M2M/IoT/WoT technology. Secondly, this paper defines the user"s requirements of UOC technology. Finally, this paper shows a set of five design restrictions of the [mm] sized UOC of a bio-NEMS having an one-body of electric-energy harvester needed for a UOC technological evolution.