Electromagnetic wave visualization device

An electromagnetic wave visualization device comprising:

• an image acquisition unit that captures an image of a target device;
• a measurement unit that measures an electromagnetic wave intensity of the target device;
• a controller that generates a composite image in which a measurement result of the electromagnetic wave intensity measured by the measurement unit is superimposed on the captured image of the target device acquired by the image acquisition unit;
• an output unit that outputs the composite image generated by the controller;
• and
• a distance measuring unit that measures a distance from the measurement unit to the target device,
• wherein the controller determines, on the basis of a frequency bandwidth that is measurable by the measurement unit, whether or not the distance measured by the distance measuring unit is within a predetermined distance at which the electromagnetic wave intensity in the frequency bandwidth is measurable, generates an alert in a case where the distance is not within the predetermined distance, and causes the output unit to output the alert.