The present invention detects a location at which projection is not suitably performed when visualization information is projected on a projection surface onto which an image is to be projected, and outputs content thereof. A projection suitability detection system (100) according to an embodiment of the present disclosure detects whether a projection surface of an operation target object (OB) generates projection distortion on the basis of a captured image of the operation target object (OB), and outputs a detection result to an instructor (CR) side.
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