PROBLEM TO BE SOLVED: To precisely monitor landslide disaster without requiring a special sensor.;SOLUTION: Information readers 20-1 to 20-3 read information of IC chips buried in gravel or stones and rocks. Information read from the information readers 20-1 to 20-3 is collected. The movement of the gravel or stones and rocks is determined on the basis of the initial information of the IC chips buried in the gravel or stones and rocks and the collected information. There are provided a landslide disaster monitoring device 10 transmitting alarm information on the basis of the determination result by the determination, a telephone set P receiving the alarm information transmitted from the landslide disaster monitoring device 10 and outputting an alarm, a contact board device R, and a billboard D.;COPYRIGHT: (C)2007,JPO&INPIT
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