PURPOSE:To prevent order information from being inputted erroneously from a keyboard not being set as an input object by arranging a keyboard switching means which sets only either the keyboards at an inputtable state based on the angle of rotation of an input means for a display part. CONSTITUTION:The input means 4 on the front and back planes of which the keyboards are provided is connected to the display part 3 formed on one plane of a display 3a in such a way that it can be rotated freely, and the keyboard switching means 3g, 4g which set only either the keyboards at the inputtable state based on the angle of rotation of the input means 4 for the display part 3 are arranged. Therefore, it is possible to input the order information by using different keyboards by rotating the input means 4 with another hand as holding the display part 3 with one hand. Also, when the input means 4 is rotated, the keyboard switching means 3g, 4g set only either the keyboards on the front and back planes at the inputtable state based on the angle of rotation of the input means 4. In such a way, it is possible to prevent the order information from being inputted erroneously from the keyboard not being set as the input object.
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