The workload is heavy in the development of an application program that controls the task distribution in consideration of the variety of the execution environment. In a system where the processing is distributed to SPUs serving as plural processing entities so as to execute the computer program, the data processing is broken into plural units of processing by referring to the script code in which the content of the data processing is written, and the units of processing are assigned to the plural SPUs. Then, the whole computer program is executed when the SPUs execute the assigned process.