Automatic transaction apparatus and control method thereof

A control method of an automatic transaction apparatus which performs a payout transaction according to a request from a user, the automatic transaction apparatus having:

• a plurality of modules which each execute processing required for the payout transaction;
• an overall control unit which controls each of the modules;
• and
• a security control unit,
• the control method comprising:
• a first step in which the security control unit holds in advance a first list in which content of signals which are exchanged between the overall control unit and each of the modules at the time of a normal payout transaction is recorded in the order in which the signals are exchanged;
• a second step in which the security control unit sequentially records the content of the signals which are exchanged between the overall control unit and each of the modules at the time of the actual payout transaction in a second list in the order in which the signals are exchanged;
• a third step in which the security control unit issues a signature approving operation of the modules when there is a match between the content of the first list and the content of the second list;
• and
• a fourth step in which the modules execute a corresponding operation when the security control unit has issued the signature.