PROBLEM TO BE SOLVED: To provide a steel tower displacement monitoring system capable of detecting a minor displacement of a steel tower and a steel tower displacement monitoring method.;SOLUTION: The steel tower displacement monitoring system includes: a target provided on the lower part of a steel tower; imaging means provided at a specific position on the steel tower in the upper vertical direction of the target for imaging the target in a state in which the imaging direction is set downward in the vertical direction; storage means for storing the position of a specific measurement object point of the target when the steel tower is in a reference state as the reference position; imaging control means for controlling imaging means to acquire a measurement image of the target at a specific timing: position detection means for detecting the position of the measurement object point as a measurement point in a measurement image; and displacement measuring means for obtaining a steel tower displacement amount of the steel tower on the basis of the target displacement amount by measuring, as a target displacement amount, an amount of a displacement of the measurement object point from the reference position to the measurement position in the measurement image.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2017,JPO&INPIT
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