An information security managing technique for use when a plurality of image processing apparatuses cooperate with each other to process a single job. In a case where a single job is cooperatively executed by a plurality of image processing apparatuses via a network, an image processing apparatus as a cooperation destination determines whether or not an image deletion level designated by an image processing apparatus as a cooperation source in the job is supported. When the image deletion level is not supported, the cooperation-destination image processing apparatus determines whether or not the job can be executed without using an HDD provided in the cooperation-destination image processing apparatus. When the job can be executed without using the HDD, the cooperation-destination image processing apparatus performs control such that the job is executed without using the HDD.