Abstract: An information processing device of the present invention includes: an acquisition unit that acquires an attribute of a target person accepting information; a language conversion unit that determines the target person based on the attribute acquired by way of the acquisition unit, and converts a language of an output target to a language corresponding to the target person; and an output control unit that outputs information in the language thus converted by way of the language conversion unit.

Abstract: A sales data processing system wherein an upper limit value, a lower limit value, and a tax amount are entered into a tax amount list. The upper limit value and the lower limit value define a predetermined range of sales amounts, and the tax amount is determined based on a sales amount defined within the predetermined range. Difference values are calculated between a presently entered one of the upper and lower limit values and a previously entered one of the upper and lower limit values, and the calculated difference values are stored in accordance with a calculation order. A first difference value series not having regularity is judged, and a second difference value series having regularity repeated in a predetermined pattern from a series of the stored difference values is also judged.