To provide a method for serving a communication which can simultaneously provide specific information only for a user belonging to a specific group in a specific district, and to provide a communication service supporting apparatus used for the same and a mobile communication terminal.

Group identification information showing a specific group is added to providing object information to be provided for a user belonging to the specific group, and the providing object information added with the group identification information is transmitted toward the specific district A. The object information to be provided for the user belonging to the specific group is encrypted by using key information for the encryption set corresponding to the specific group, and the encrypted object information may be transmitted toward the specific district A.