Abstract: A portable terminal device determines whether it is used in an opened state or a closed state (for example, a folded state) using a terminal shape determination unit of a CPU. A browser running determination unit determines whether a browser executed by the CPU of the portable terminal device is running. A touch panel determination unit determines whether a touch operation is being performed on a back screen and whether a touch operation is being performed on only the back screen. A touch area determination unit performs a determination as to whether a touch operation is being performed on an upper screen area and a determination as to whether a touch operation is being performed on a central screen area. A long-press touch determination unit performs a determination as to whether a touch operation is being performed having a predetermined length greater than a normal touch length.

Abstract: A calling and display unit displays the image of a function calling icon (FCI) on at least one of the four corners of a screen of a touch panel. An icon calling unit calls function activation icons (FAI) in correspondence to a touch manipulation on the FCI. A function display unit displays the images of the called FAIs so as to be arranged on at least one of the four sides of the screen, which communicates with one of the four corners where the FCI is located. Therefore, the proportion in which the images of the displayed FAIs obstruct a display image displayed on the screen can be minimized. In this way, a data processing device minimizes the proportion in which the images of the FAIs displayed on the touch panel obstruct the display image.

Abstract: A portable terminal device (100) according to the present invention includes determination processing unit that performs a first determination process regarding whether switching of a set value is valid or invalid and performing a second determination process for a current set value; display unit that displays a screen; and display control unit (130) that performs a control to display, in a predetermined display area of the screen, a switch button representing switching of a set value corresponding to the current set value determined in the second determination process when the switching is determined as valid in the first determination process, and for performing a control not to display the switch button in the predetermined display area when the switching is determined as invalid in the first determination process.

Abstract: A calling and display unit (130) displays the image of a function calling icon (FCI) on at least one of the tour corners of a screen (111) of a touch panel (110). An icon calling unit (140) calls a plurality of function activation icons (FAI) in correspondence to a touch manipulation on the function calling icon (FCI). A function display unit (150) displays the images of the plurality of called function activation icons (FAI) so as to be arranged on at least one of the four sides of the screen (111), which communicates with one of the four corners where the function calling icon (FCI) is located. Therefore, the proportion in which the images of the plurality of displayed function activation icons (FAI) obstruct a display image displayed on the screen (111) can be minimized. In this way, a data processing device capable of minimizing the proportion in which the images of the plurality of function activation icons displayed on the touch panel obstruct the display image is provided.