The present invention relates to a method to calculate an offline social influence index, capable of effectively performing advertisement with respect to a user visiting or planning to visit a store. According to the present invention, the method comprises: a first step of mapping and storing first identification (ID) information to identify a point of sales (POS) device installed in each store and second ID information to identify a tablet device installed in the same store; a second step of receiving unregistered particular information from the POS device corresponding to the first ID information; a third step of receiving unique ID information inputted through a tablet device in order to register the particular information from the tablet device corresponding to the second ID information mapped to the first ID information; a fourth step of linking and storing the unique ID information with the particular information in a storage medium; a fifth step of reading the stored particular information to select a representative payer, who performs payment on the behalf of visiting customers, in a store belonging to a business category capable of being simultaneously used by a plurality of customers; a sixth step of acquiring acquaintance information of a specified user selected as the representative payer, and linking and storing the acquaintance information with ID information of the specified user in the storage medium; a seventh step of confirming a particular information set recognized as an acquaintance visits the same store after the specified user visits a predetermined store; an eight step of calculating an offline social influence index with respect to the specified user; and a ninth step of linking and storing the social influence index with the ID information of the specified user in the storage medium.;COPYRIGHT KIPO 2018
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