Goods sale data processor and control method thereof

A goods sale data processor comprising:

• registering unit for performing a process of registering goods to be transacted;
• storage unit for storing reserved registering information to be reserved;
• reserved registering information updating unit for updating and storing the reserved registering information to be reserved in the storage unit when the registering process is reserved, the registering process is being performed by the registering unit, and when the updated reserved registering information is notified from another goods sale data processor;
• reserved registering information notifying unit for notifying another goods sale data processor of the reserved registering information updated by the reserved registering information updating unit when the processor reserves the registering process;
• and
• restarting unit for receiving the selection of the reserved registering information used to restart the registering process out of the reserved registering information stored in the storage unit and restarting the registering process using the selected reserved registering information when the registering process is requested to restart.