The present invention provides a shadow community producing system matched to a variable area of an internet base and a method of the same, which allows users connecting with unspecified web sites of an internet base to arbitrarily and automatically construct a community area in the web sites in real time, and allows a number of third parties connecting to the web sites to confirm creation information regarding the community and access to the community area, thereby enhancing convenience and consistency in information sharing. The present invention has advantages in that it allows users to create shadow communities matched with URLs on all areas accessible through the user's terminals regardless of web site producing companies, thereby sharing objective information with many and unspecified users; allows users to freely create and manage shadow communities for web sites not having communities, categories, and products.