A distance information generator comprises an image sensor which senses an object, a distance detector which detects a first distance between a predetermined position and the object, a memory which stores position information expressing a mutual positional relationship of the predetermined position and the position of the image sensor, and a calculator which calculates a second distance between the position of the image sensor and the object based on the first distance and the position information. A display device displays a composite image which consists of a sensed image and a virtual image for an observer, wherein the composite image is created by comparing the second distance and distance information involved in the virtual image.

 
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