To provide a deposit processing method in an electronic wallet system capable of making a consumer obtain advantages just by carrying an IC card around and spreading electronic money.

This deposit processing method is provided with a step (S32) for transferring a transaction log and the balance inside the IC card to the bank account of the customer and a step (S49) for rearranging the transaction of the bank account and the transaction by the IC card in a time sequential order and a deposit interest is calculated for the balance in which the balance of the IC card and the balance of the bank account are added (S71).