A method for allocating computing resources of a processor is provided. The method includes the follows. A current processor load is detected. Required computing resources are determined according to the current processor load. The required computing resources correspond to a total frequency of each processor core. Priori power values of each processor core at different frequencies are obtained. The number of processor cores and a frequency of each processor core are determined according to the priori power values of each processor core at different frequencies, such that a total frequency of each processor core satisfies the computing resources and a total power value of each processor core is minimum.