Provided are a method of managing power of a multi-core processor, a recording medium storing a program for performing the method, and a multi-core processor system. The method of managing power of a multi-core processor having at least one core includes determining a parallel-processing section on the basis of information included in a parallel-processing program, collecting information for determining a clock frequency of the core in the determined parallel-processing section according to each core, and then determining the clock frequency of the core on the basis of the collected information. Accordingly, it is possible to minimize power consumption while ensuring quality of service (QoS).