To provide an information display method which more clearly displays a relation between an object to be measured and a measurement result.

An electromagnetic wave measuring system 1 has an information display device 10 and a screen 30. The information display device 10 includes an antenna 12, a camera 14 and a projector 16. The information display device 10: measures intensity of electromagnetic wave emitted from a measuring object device 20 (an object to be measured) through the antenna 12; specifies a measuring point by the antenna 12 based on an image taken by the camera 14; and generates the image to be projected based on the intensity of the measured electromagnetic wave as well as the specified measuring point. The projector 16 projects the generated image on a surface of the device 20 as well as the screen 30 arranged around the device 20.