A control system comprising: a timing device comprising: a detector to detect 180-degree upside-down rotation of the timing device, the detector comprising an acceleration sensor to detect a direction of a gravity of the timing device; and a radiotransmitter to wirelessly transmit a predetermined signal including identification information of the timing device or information for determining a predetermined time from a time point at the 180-degree upside-down rotation of the timing device, upon detection of the 180-degree upside-down rotation by the detector, the timing device indicating an elapsed time from the time point at the 180-degree upside-down rotation; and a computer comprising: a receiver to receive the predetermined signal; and a transmitter to start transmission of a control signal according to a control scenario determined with the predetermined signal to at least one predetermined device (21, 22, 23, 24) other than the timing device when switching of the timing device to an operational mode is determined with the predetermined signal received by the receiver, and to transmit a signal indicating the end of the control for the at least one predetermined device (21, 22, 23, 24) when switching of the timing device to a nonoperational mode is determined with the predetermined signal received by the receiver. a timing device comprising: a detector to detect 180-degree upside-down rotation of the timing device, the detector comprising an acceleration sensor to detect a direction of a gravity of the timing device; and a radiotransmitter to wirelessly transmit a predetermined signal including identification information of the timing device or information for determining a predetermined time from a time point at the 180-degree upside-down rotation of the timing device, upon detection of the 180-degree upside-down rotation by the detector, the timing device indicating an elapsed time from the time point at the 180-degree upside-down rotation; and a detector to detect 180-degree upside-down rotation of the timing device, the detector comprising an acceleration sensor to detect a direction of a gravity of the timing device; and a radiotransmitter to wirelessly transmit a predetermined signal including identification information of the timing device or information for determining a predetermined time from a time point at the 180-degree upside-down rotation of the timing device, upon detection of the 180-degree upside-down rotation by the detector, the timing device indicating an elapsed time from the time point at the 180-degree upside-down rotation; and a computer comprising: a receiver to receive the predetermined signal; and a transmitter to start transmission of a control signal according to a control scenario determined with the predetermined signal to at least one predetermined device (21, 22, 23, 24) other than the timing device when switching of the timing device to an operational mode is determined with the predetermined signal received by the receiver, and to transmit a signal indicating the end of the control for the at least one predetermined device (21, 22, 23, 24) when switching of the timing device to a nonoperational mode is determined with the predetermined signal received by the receiver. a receiver to receive the predetermined signal; and a transmitter to start transmission of a control signal according to a control scenario determined with the predetermined signal to at least one predetermined device (21, 22, 23, 24) other than the timing device when switching of the timing device to an operational mode is determined with the predetermined signal received by the receiver, and to transmit a signal indicating the end of the control for the at least one predetermined device (21, 22, 23, 24) when switching of the timing device to a nonoperational mode is determined with the predetermined signal received by the receiver.