PURPOSE: A system and a method for integratedly inquiring/paying a bill centered on a customer and a biller through a standard bill format are provided to inquire/settle the unified bill on the online by constructing a database as automatically converting the tax/public imposition bills into the same format. CONSTITUTION: A bill information database(520) stores the tax/public imposition bills converted into the same format. A bill formant conversion module(560) generates the tax/public imposition having the same format by receiving/reading the tax/public imposition bill issued from bill issuing servers, and registers/stores the tax/public imposition information to the database. A bill inquiry module(570) makes a user request the tax/public imposition for the online payment by inquiring the tax/public imposition bill registered to the database, register a payment toll, and inquire the detail particulars of the tax/public imposition bill. A settlement module(580) makes the user pay the billed price of the inquired tax/public imposition bill with the registered payment tool, and registers/stores settlement information to a settlement information database(530).
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