In systems which execute transactions with an ATM using an IC card in which plural account information is registered in advance, one or more transaction information and intended use information indicating the intended uses of transactions to be executed by the ATM based on the transaction information are associated with each other and are registered as transaction data in the storage section of the IC card, so as to certainly prevent transactions or selections of accounts which are not intended by the user from being erroneously executed. Prior to the execution of transactions by the ATM, the transaction data is read out for the ATM and the intended use information included in the transaction data are displayed along with said transaction information included in the transaction data, in a transaction selection screen on the ATM.