1. A magnifying observation apparatus comprising: an imaging section for photographing an observation image; a display section for displaying the observation image based on an image signal acquired with said imaging section; an edge detection section for performing signal processing on the image signal acquired with said imaging section and detecting edge information on an edge contained in the observation image; a point indication section for indicating an arbitrary point in the observation image displayed with said display section; an edge extraction section for extracting an edge section on the periphery of the point indicated with said point indication section based on the edge information on the observation image; and a highlight section for performing predetermined image processing on the edge section extracted with said edge extraction section and displaying the resulting edge section over the observation image.