Abstract: An arithmetic processing device includes: a reception unit for receiving information including a numerical value and an operator; a generation unit generating arithmetic information regarding an arithmetic operation and having a plurality of codes including the numerical value and the operator that are received; and an information transmission unit transmitting the generated arithmetic information to an external device. The generation unit generates the arithmetic information in which the codes are arranged so that, when a plurality of rows including numerical values and operators are displayed on a display unit of the external device in accordance with the arithmetic information, an arrangement of a numerical value and an operator in each displayed row and an arrangement of a numerical value and an operator in another displayed row are matched to each other.