This paper examines how public education can ensure equity and diversity by clarifying the "democratic aspects" that can be captured through school-community collaborative activities in Japan and the U.S. As a result of comparison and analysis, it is indicated that in both Japan and the U.S., these activities are conducted in the context of streamlining educational administration. In addition, the participation in school management of diverse people such as local residents, parents, and children is promoted in order to grasp their needs and achieve deliberation on an equal footing. In contrast to Japan, however, these activities in the U.S. put importance on providing health and educational services to disadvantaged families and children. Furthermore, they aim to change not only schools but also communities. Therefore, this paper suggests that "democratic aspects" encompassed by collaborative activities have multiple layers: (1) "compensatory-type" (status-quo satisfaction -oriented democratic aspects), (2) "participatory-type" (deliberation-oriented democratic aspects), and (3) "transformative-type" (status-quo change-oriented democratic aspects). In order to guarantee equity of education that ensures fairness and inclusion to all children, this paper clarifies the importance of having both activities that distribute educational and welfare services on a curve to disadvantaged children and families (compensatory-type) and activities that involve children themselves in the practice, leading to the transformation and creation of the world (participatory and transformative type). The types of activities described above do not necessarily set the transformative-type as the ultimate goal. The three types interact together and pave the way toward a democratic and equitable education that is open to all and respects the voices of minorities.