A power control system includes power control target units, each of which has a power source and is used by at least one of jobs; job executing units configured to execute the jobs; and a power control unit configured to control the power source of each of the power control target units based on execution results of the jobs by the job executing units. The power control unit includes a job execution scheduling table generating section configured to generate a job execution scheduling table for each of the power control target units based on a control data, such that the job executing units execute the jobs in the job execution scheduling tables; a job execution scheduling table updating section configured to delete a job name of each of the jobs from the job execution scheduling tables when execution of the job is completed, and output a job completion notice; and a power off judging section configured to control the power sources of the power control target units used by the job to be turned off in response to the job completion notice.