Technique for dynamically controlling processing devices in accordance with characteristic of user application

Disclosed is a method by which a terminal device executes an application by using at least one calculating device, the method comprising the steps of: calculating a processing time of the at least one calculating device; selecting the predetermined number of processing devices for executing the application on the basis of a user's preference or the at least one calculated processing time; determining a workload for minimizing a processing time function determined by using a use rate corresponding to the predetermined number of determined processing devices; and executing the application by applying the determined workload to the predetermined number of processing devices.