Abstract: A system and method for providing financial transaction service provides feedback service to a user in real time through SMS/ACS/CRM center, automatically classified according to approval rejection type, when financial service transaction is rejected or financial service is stopped halfway for an arbitrary reason while the user is provided with financial service such as cash service or card loan service through a web, ATM, ARC or mobile device such that the user can re-use the financial service. When a user who wants to use financial service such as cash service or card loan service through ATM, ARS or mobile device cannot use desired financial service because of excess of cap, personal identification number error, rejection of transfer or stopping use of financial service halfway, it is determined whether the user corresponds to re-transaction rejection condition designated by a financial institution and provides the desired financial service to the user.