A computer-readable storage medium encodes computer executable instructions that, when executed by at least one processor, associate plural applications. That associating method includes receiving an application programming interface associated with each of the plural applications. The method also includes unifying the received application programming interface associated with each of the plural applications, and classifying the application programming interface associated with each of the plural applications. The plural applications are classified into one or more categories. Further, the method includes associating the application programming interfaces based upon the classifying and a pre-determined set of rules.