To grasp transaction prediction time before the execution of transaction which a customer selects by screen-displaying transaction prediction time at the time of waiting for the keying of a recognition key when transaction is selected by the operation of the customer.

The customer executes the operations before transaction such as card insertion, transaction selection and the input of a password. A device calculates transaction prediction time in a transaction prediction time calculation part 6 based on statistical information which is previously stored. The device makes a screen display device 4 execute display for urging the keying of the recognition key. At that time, the transaction prediction time calculation part 6 transmits calculated data to a screen display control part 5. The screen display control part 5 receives said data and also displays data on received transaction prediction time. The calculation of transaction prediction time is easy for the simple transaction of money reception and payment but transaction difficult for prediction before execution such as the keeping of books, in which transaction time depends on the number books which are not kept on the user also exists. In such a case, data which are previously set are screen-displayed.