An object of this invention is to allow deleting/updating firmware at high speed and properly deleting/updating a software part for executing a job without posing any problem in a general job in an image processing apparatus which executes a job by combining a plurality of independent software parts. For this purpose, when updating one software part associated with an image processing job, it is determined whether a standby job as a job contains a software part to be updated. If it is determined that the standby job does not contain any software part to be updated, the software part is updated. If it is determined that the standby job contains the software part to be updated but a software part in another image processing apparatus on the network can replace the software part to be updated, software parts which execute the job are reconstructed to update the target software part. If it is determined that no alternative image processing apparatus exists, the update request is saved and held.