An embedded system comprises a storage device, a main memory, and an operating system (OS). The storage device stores executable files, data files, and at least one dependency tag of an application which have been installed on the embedded system. The dependency tag records relationships between the application and related data files utilized by the application under various execution statuses. The OS comprises a module which, when requested to execute the application, locates the related data files of the application according to the dependency tag, loads the executable file and the related data files to the main memory, and execute the executable file.