Abstract: For example, a communication service controlling exchange apparatus (1) which can control a condition of a communication service to be provided includes call control memories (131-1 to 131-M) individually provided for paths between user terminals. User terminal registration information of those user terminals which can enjoy a communication service of a desired form is registered in the call control memories (131-1 to 131-M), and a communication service providing section (121) for linking the call control memories (131-1 to 131-M) with each other so that a communication service of the desired form can be provided is formed. A link changing control section (122) for changing the mutually linked condition of the pertinent ones of the call control memories (131-1 to 131-M) is provided in order to allow form changing to a communication service of a different form. Consequently. communication services of a plurality of kinds of forms can be provided by the single exchange apparatus (1).