A medium evaluation method for evaluating a commodity information provision medium that commodity consumers expect to use as an acquisition unit of commodity information provided by a commodity provider at each step of a purchase process wherein: expectation information is associated with kinds of commodity information provision media that commodity consumers expect to use at each step of the purchase process, and access information is used to access the consumers from whom the expectation information is acquired, the method includes: in response to specifying a certain commodity information provision medium at a certain step of the purchase process in the expectation information, specifying access information of a consumer who expects to use the specified commodity information provision medium at the specified step of the purchase process from the access information.