In a computer system having a remote controller storing a user identification number, the remote controller generates a remote control signal for remote control of the computer system, and a remote control signal receiver receives the remote control signal from the remote controller. User identification numbers are stored in the remote controller and the remote control signal receiver, respectively. If the two user identification numbers match, a function corresponding to the remote control signal from the remote controller is performed. The function corresponding to the remote control signal corresponds to an assigned button of the remote controller in accordance with power state information of the computer system. The remote control signal can not only execute an assigned program, but also perform an automatic log on of the operating system, such as a windows operating system. As a result, the computer system can carry out batch processing of application programs, including the operating system, in accordance with the remote control signal assigned by the remote controller.