Abstract: A sales data processing apparatus including: communication unit configured to transmit sales data to an external apparatus; and a processor configured to cause a predetermined printer to print the sales data, wherein the processor causes the printer to print, together with the sales data, information indicating whether the sales data has been transmitted via the communication unit.

Abstract: An input device that performs input control in accordance with display content displayed on a display device, including: a storing section which stores a plurality of input control information corresponding to a plurality of display identification information respectively assigned to a plurality of display contents capable of being displayed on the display device; a receiving section which receives display identification information of display content currently being displayed on the display device; and a processor which performs retrieval processing for retrieving from the storing section input control information corresponding to the display identification information received by the receiving section, and input control processing for performing input control based on the input control information retrieved in the retrieval processing.

Abstract: A sales data processing device comprises electromagnetic wave clock means for receiving a time signal containing date and time information transmitted from a transmission station, and clocking a date and time by correcting the date and time based on the received time signal, clock means for clocking the date and time based on the date and time obtained from the electromagnetic wave clock means, processing determination means for determining whether data processing is being executed or not, correction means for correcting the date and time of the clock means based on the date and time obtained from the electromagnetic wave clock means in a period of no execution of data processing, and data processing means for processing input sales data by referring to the date and time clocked by the clock means in a period of execution of data processing.

Abstract: A sales data processing device comprises electromagnetic wave clock means for receiving a time signal containing date and time information transmitted from a transmission station, and clocking a date and time by correcting the date and time based on the received time signal, clock means for clocking the date and time based on the date and time obtained from the electromagnetic wave clock means, processing determination means for determining whether data processing is being executed or not, correction means for correcting the date and time of the clock means based on the date and time obtained from the electromagnetic wave clock means in a period of no execution of data processing, and data processing means for processing input sales data by referring to the date and time clocked by the clock means in a period of execution of data processing.