The present invention quantitatively evaluates how an upper page of a search result of a search term as a target of SEO changes with time. An input step in which a search word is input, search result data based on a search word when the first point is set as a searcher's position, and a second different from the first point An acquisition step of acquiring search result data based on a search term when the point is a searcher's position, and an index indicating a correlation between the search result data of the first point and the search result data of the second point And an analysis step for outputting the index as an analysis result specific to the search term. [Selection] Figure 2
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