Information input device and method and medium for inputting information in 3D space

An information input device for inputting information in three-dimensional space, comprising:

• an input unit to receive a user input;
• motion detector to detect a movement of the information input device in a three-dimensional (3D) space;
• a movement identifier to identity a movement type of the information input device based on output information from the motion detector;
• a pointer controller to move or to maintain a location of a pointer on a screen of a display device;
• and
• a processor configured to
• determine whether the movement type is a user actuation for the input unit or a drag operation of the information input device in the 3D space based on information outputted from the movement identifier, and configured to change or maintain the location of the pointer on the screen based on the output information and the movement type,
• wherein if the movement type is the user actuation for the input unit, the location of the pointer on the screen is not changed,
• wherein if the movement type is the drag operation, the pointer is dragged on the screen, and
• wherein the pointer is located on an object based on the output information, and the movement type is determined to be a button click operation of the input unit if a movement of the pointer is smaller than a predetermined threshold.