A portable terminal apparatus and method for inputting data for the portable terminal apparatus

The present invention relates to a method and apparatus for receiving data from a virtual input device by detecting and analyzing the motion of the user input means to only one of the two-dimensional image sensor without projecting the virtual input device. To this end, in accordance with the present invention a mobile terminal device for receiving data from the user input means by using the virtual input device, an image recognition unit which outputs the image data to recognize an image of the user input means; An image analyzer for detecting position data and motion data of the user input means from the image data; Data type determination unit that determines the data entered in the virtual input device, the position data of the detected user input means and from the motion data; Screen display unit for displaying on the screen together with the virtual input device and the image data of the user input means; And the virtual input device of the size and the user based on the proportional value of the range of the input means, the motion and reset the motion range of the user input means, for the data type of the user input means according to the type of the virtual input device the initial set of initializing the image features characterized by comprising a. A mobile terminal device, a virtual input device, an image sensor, optical flow