A job execution apparatus includes a partial job allocation processing section and a partial job execution instruction section. The partial job allocation processing section allocates each partial job formed by segmenting a received job to a data processing apparatus capable of executing the partial job. The partial job execution instruction section instructs the data processing apparatus to execute the partial job. The partial job allocation processing section reallocates a partial job, which execution was not completed by the data processing apparatus to which the partial job is allocated until a preset end time, to a data processing apparatus capable of executing the unfinished partial job, other than the data processing apparatus to which the unfinished partial job is allocated. The partial job execution instruction section transmits an instruction for executing the unfinished partial job to the reallocated data processing apparatus.