Abstract: A computer system and operating method thereof are provided. The computer system comprises a central processing unit (21) and a random access memory (22). The random access memory (22) is provided with a resource allocating management storage region (32) for storing execution sequence of the central processing unit executing an application program, and a resource allocating management unit (31) for dynamically changing the execution sequence according to request amount of resource occupied by a plurality of application programs, wherein the execution sequence is such that the execution priority level of an application program with a small request amount of resource is higher than the execution priority level of an application program with a large request amount of resource.