Disclosed is an image forming apparatus which registers jobs in an order of acceptance of the jobs and which carries out an image forming process and a post-processing for a recording medium according to a content of the registered jobs comprising a comparing unit to compare a time needed for a post-processing of a first job which is being executed with a time needed for an image forming process of a second job which is on stand-by and which is registered and a control unit to execute the image forming process of the second job which is on stand-by after an image forming process of the first job which is being executed is ended and while the post-processing of the first job is being executed according to a comparison result of the comparing unit.