1. A method, comprising: launching an application program including loading a main program module in an operating system; checking if a desired program module has previously been loaded, wherein the desired program module is a plug-in program that provides additional functionality not provided by the main program module; loading the desired program module in the operating system in response to a request for the additional functionality; and recording one time of execution thereof in an execution frequency record of program modules corresponding to the application program if the desired program module had not previously been loaded.