Disclosed herein are a data input device and an input conversion method using the data input device. The data input device includes a detection unit provided in a predetermined input region, the detection unit processing first directional input that generates a first directional input signal through detection of lateral pressing in a predetermined radial direction by a finger placed at a reference location in the input region, second directional input that generates a second directional input signal through detection of vertical pressing in a predetermined direction in a state in which the finger is placed at the reference location, third directional input that generates a third directional input signal through detection of tilt pressing in a state in which the finger is placed at the reference location, and fourth directional input that generates a fourth directional input signal through detection of a tilt input in a state in which the finger is placed at the reference location; and a control unit configured to determine input locations of a lateral pressing direction, vertical pressing direction, tilt pressing direction and tilting direction of the finger, extract relevant data from memory, and input the extracted data; wherein the data is input through combination of two or more of the first to fourth directional inputs.