According to an exemplary embodiment of the present disclosure, a computer program stored in a computer readable storage medium is disclosed. The computer program includes instructions which cause a processor to execute steps, the steps including: classifying a first group and a second group by executing static analysis to a code including plural steps stated in Job Control Language (JCL), the first group including one or more steps where pipelining is available, the second group including one or more steps where pipelining is unavailable; determining a sequential or parallel execution of the plural steps based on a classification result; and transferring an output data of a first step to an input stream of a second step based on an order of steps included in the first group when processing steps included in the first group among the plural steps.