To provide a representative server for converting the information format into an information format that can be received by a bank business system and also receiving update information from the bank business system to provide the update information to a customer terminal.

This representative server connected to the bank business system for processing information about bank business and for representatively performing transaction business corresponding to a request from the customer terminal, has an information format converting means for converting a first information format of transaction information about a transaction received from the customer terminal into a second information format that can be received by the bank business system, an update information managing means for receiving the transaction information updated by the bank business system to manage the updated transaction information, and an update information providing means for providing the customer terminal with the updated transaction information in response to a request from the customer terminal.