| http://www.w3.org/ns/prov#value | - The advertisement servicing method according to claim 8, wherein the step e) comprises the sub-steps of: e1) determining whether the e-mail read data is input from the plurality of user computers; e2) analyzing the number of advertisements exposed to users and the types of advertisements, by a plurality of pieces of advertising data, based on the e-mail read data input from the plurality of user c
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