PROBLEM TO BE SOLVED: To provide a technique for efficiently collecting information on a name of a store or the like having a topic. SOLUTION: The post analysis system uses a storage unit including post information including text associated with an image including one or both of a moving image and a still image, and a predetermined word included in the text as a name candidate. It includes a name candidate extraction unit to be extracted, and a related image collection unit that searches for posted information that includes name candidates in text and collects associated images as related images. [Selection diagram] Fig. 1
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