An information processor is provided, for preventing an illegal operation from being caused by configuration information set in the information processor being updated, even if the information processor receives configuration information from outside during execution of a job. The information processor makes it possible to know and externally confirm that update has not been performed, and updates the configuration information as soon as possible after the job ends. If configuration information is input from an external device, the information processor included in, for example, a multi-function peripheral determines whether the information processor is executing a job. If it is determined that the information processor is not executing a job, then the received configuration information is recorded and the configuration information is updated. If it is determined that the information processor is executing a job, then the receiving operation is terminated.