To prevent erroneous operation due to living vibration or the like of equipment that is operated when an earthquake occurs with simple structure by judging that the earthquake has occurred only when a signal in a specific frequency range that is an earthquake frequency is received.

The program judges that an earthquake has occurred when a signal from a vibration sensor with a frequency of 0.5 Hz lasting for 2 seconds or less and with a frequency of 3 Hz lasting for 1/3 or more is received, and judges that a high-frequency signal with a frequency of 3 Hz lasting for 1/3 or less is judged to be living vibration. More specifically, when the length of a signal from the vibration sensor is 2 seconds or less and 1/3 seconds or more, counting is started. Then, when a set count number (n) is counted, it is judged that an earthquake has occurred, thus sending an operation signal to equipment to be operated. When a signal that has been sent from the vibration sensor is equal to or less than 1/3 seconds, most frequently a user bumped against the equipment by accident or the like, so that it is judged that the vibration has been caused by living vibration and the equipment cannot be operated without any counting. Also, when a signal from the vibration sensor lasts 2 seconds or more, it is judged that the equipment has tilted and no counting is made.