External signal type aircraft warning and method for defending, computer reading possible medium and the system are disclosed. As for the monitoring system it is possible, to have sensor field or sensor array, it is possible to have the processor system which processes the signal which includes the sound signaling which is received by sensor array. The signal which includes the sound signaling is processed in order to decide the existence of the representation which includes, the acoustic quality of the known sam which includes the portable possible air defense system. When existence of that kind of sam is shown, one of the chaff, extension type decoy and the flare etc or one which has many corresponding expedients than that or the signal signal is transmitted to many corresponding expedient systems than that. As for the corresponding expedient system it is possible to make the system of system of land-based type or airborne type. Corresponding expedient is developed responding to the signal signal. As a result, it can evade the sam.
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