A noise source visualization system comprises: a circuit simulator which, using design data, outputs information which denotes transient characteristics of electrical signals of a plurality of electronic components which configure an electrical circuit; a representative spectrum determination unit which determines a spectrum of a representative electrical signal from among the electrical signals of the plurality of electronic components; a representative spectrum component calculation unit which outputs information including a size of a component of a spectrum of a representative electrical signal which is included in a peripheral electromagnetic field spectrum; a representative spectrum location extraction unit which outputs a location upon the electrical circuit substrate of the spectrum of the representative electrical signal; an overlay image generation unit which, with respect to an image which is captured by an image capture unit, in the location of the representative electrical signal upon the electrical circuit substrate, superpositions a marker having a size corresponding to the component of the spectrum of the representative electrical signal: and a display unit which displays the image with the marker superpositioned thereupon.
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