An information processing system comprising: an operation unit; and a controller configured to operate based on a request received from the operation unit, the operation unit including a processor configured to implement a storage unit configured to store a portion of address information stored in the controller, and a first communication control unit configured to transmit a job execution request for execution of a predetermined job to the controller, wherein reception of the job execution request causes the controller to execute any of a print process, a copy process, a facsimile process, and a scan process for transmission to a destination address selected from the address information stored in the controller, wherein, the controller includes a second communication control unit configured to establish, when an activation process of the information processing system is performed, a communication connection between the operation unit and the controller, and transmit a communication establishment notification to the operation unit, in a case where the first communication control unit controls the transmission of the job execution request to transmit to the controller before the communication connection between the operation unit and the controller is established, the first communication control unit controls the transmission of the job execution request to transmit to the controller the job execution request by using the communication establishment notification received from the second communication control unit as a trigger, and the controller includes an execution unit (254, 258) configured to execute the predetermined job based on the job execution request received from the operation unit. an operation unit; and a controller configured to operate based on a request received from the operation unit, the operation unit including a processor configured to implement a storage unit configured to store a portion of address information stored in the controller, and a first communication control unit configured to transmit a job execution request for execution of a predetermined job to the controller, wherein reception of the job execution request causes the controller to execute any of a print process, a copy process, a facsimile process, and a scan process for transmission to a destination address selected from the address information stored in the controller, wherein, the controller includes a second communication control unit configured to establish, when an activation process of the information processing system is performed, a communication connection between the operation unit and the controller, and transmit a communication establishment notification to the operation unit, in a case where the first communication control unit controls the transmission of the job execution request to transmit to the controller before the communication connection between the operation unit and the controller is established, the first communication control unit controls the transmission of the job execution request to transmit to the controller the job execution request by using the communication establishment notification received from the second communication control unit as a trigger, and the controller includes a second communication control unit configured to establish, when an activation process of the information processing system is performed, a communication connection between the operation unit and the controller, and transmit a communication establishment notification to the operation unit, in a case where the first communication control unit controls the transmission of the job execution request to transmit to the controller before the communication connection between the operation unit and the controller is established, the first communication control unit controls the transmission of the job execution request to transmit to the controller the job execution request by using the communication establishment notification received from the second communication control unit as a trigger, and the controller includes an execution unit (254, 258) configured to execute the predetermined job based on the job execution request received from the operation unit.