FIELD: information technology.
SUBSTANCE: data input device has a plurality of input keys, wherein single-step input for inputting a first symbol and two-step input for inputting a second symbol are performed independently; a sensor for detecting single-step input and two-step input at the input keys; and a controller for retrieving from memory the first or second symbol assigned to the corresponding input key in a duplicative manner, depending on the detecting result from the sensor for input of the first or second symbol.
EFFECT: enabling input of the required symbol through minimum activation of input keys.
20 cl, 34 dwg
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