The following is included: a condensed condition setting unit (104) for setting a condensed condition to extract a location closely related to a target person of interest; an important location extracting unit for extracting a location closely related to the target of interest in each of a plurality of time periods based on location information indicating the location of the target of interest and a summarized condition set by the aggregated condition setting unit (104); an image generation unit (106) for calculating the areas of image areas of images representing a location closely related to the target person of interest extracted by the important location extraction unit and a distance between the image areas, and for generating graphic image data, to display an image representing a location closely related to the target of interest in a hierarchical structure; and a graphics unit (109) for displaying graphic image data generated by the image generation unit (106) on a screen device (4).
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