Data processing apparatus and method for controlling data processing apparatus

When a plurality of jobs are processed using a plurality of data processing units, data formats of the jobs to be processed can be determined to distribute a data processing load of the data processing units. A method for controlling a data processing apparatus for causing a plurality of data processing units to process data of a job includes storing data of a first job in a storing unit in first and second data formats, determining whether to process the stored data of the first job in the first or second data format, and causing the plurality of data processing units to process the data in the determined data format. The determination is made based on whether processing of data of a second job by the first or second processing unit requires longer time.