In Germany, while arriving at a conclusion on the Immigration Act and discussing the integration of foreign residents in the society over several years, the concept of a ‹multicultural society› was often disputed. Does the Act promote the integration of foreign residents by affirming a multicultural society as an actuality or by denying it as a fantasy? The disputes have such contradictory characteristics. In the 1980's, in contrast with the national level, cultural diversification advanced in Berlin and the policies that planned the inclusion of foreign residents in the society as well as the reform of the society itself kept advancing. Before 1989, whether or not a multicultural society was a reality was a matter of dispute; moreover, the political circumstance of the East-West divide, led to both affirmative and negative opinions for a multicultural society. But after 1990, when East and West Germans were integrated and accepted mass refugees, the concept of a multicultural society as an actuality began to be received widely. The arguments about a multicultural society changed to question what kinds of members form societies on what types of common bases. That is evident in the disputes on the ‹multicultural society› in 1998. And under the approval for cultural diversity, the common basis of society in relation to foreign residents became an issue of debate. The arguments about multicultural society in Berlin have shown that society is questioned and changed by foreign residents. In that sense, the affirmation and denial of a multicultural society are the affirmation and denial of the change in society by foreign residents. The conflicts that are related to the multicultural society in the city are located in the process of construction of the relationship between foreign residents and society in a space, namely, a city.