Abstract:
A method for displaying a plurality of key icons on a display includes displaying a first screen on the display, the first screen having at least one first key icon and a plurality of second key icons, wherein the first key icon corresponds to a first input instruction while each of the second key icons respectively corresponds to a respective one of a set of second input instructions; and displaying a second screen on the display, the second screen having at least one third key icon and a pull down menu, wherein the third key icon is bigger than the first key icon but corresponds to the first input instruction, and the pull down menu corresponds to the set of second input instructions.

Description:
This application is a continuation of U.S. application Ser. No. 10/634,907, which was filed on Aug. 6, 2003, and which is based on Japanese Patent Application No. 2002-230306 filed on Aug. 7, 2002, and 2002-230308 filed on Aug. 7, 2002, the contents of which are hereby incorporated by reference 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The invention relates to a data input device, in particular, a data input device that is capable of showing a plurality of key images on its display screen, and entering data assigned to said key images when input designation areas are designated on said display screen. 
   2. Description of Related Art 
   The use of various multi-function peripheral (“MFP”) devices having multiple functions such as scanning, printing and copying has become popular in recent years. On such an MFP, an operating panel using a touch panel is normally adopted as a data input unit. Such an operating panel has a touch panel provided on the display screen to show various operating key images, detects that a input designation area that corresponds to a specific key image is designated by the user by means of the touch panel, and enters the data assigned to said key image. 
   In case of such an operating panel, due to an increasing number of varieties and complexities of MFP&#39;s functions, it is keenly needed to make the operating screen easier to understand and simpler to operate; for example, it is strongly desired to develop a data input device capable of allowing the operator to customize the operating screen easily, for example, modifying the sizes of certain keys depending on frequencies of their uses, rather than displaying all operating keys simultaneously in the same mode. 
   In the meanwhile, a data input device using a touch panel with a capability of modifying the key sizes has been disclosed (JP-A-5-197471), but said device is for the operator to select desired key sizes from the prearranged key size table so that it was incapable of allowing the operator to modify the sizes of specific operating keys sizes arbitrarily and automatically modifies the layout of other operating keys. 
   SUMMARY OF THE INVENTION 
   The invention is made to solve the aforementioned problems of the prior art, and it intends to provide a data input device that is capable of showing a plurality of key images on its display screen, and, when an input designation area is designated corresponding to the display area of a key image on said display screen, entering data assigned to said key image; in particular, such a data input device that allows the operator to modify the sizes of specific operating keys arbitrarily and automatically modifies the layout of other operating keys. 
   Said objective of the present invention can be accomplished by the following means: 
   (1) A data input device for displaying a group of key images on a display screen and when an input designation area is designated on said display screen corresponding to a display area for each key image belonging to said group of key images, entering data assigned to said key image, comprising: a key image size modifying unit for modifying the size of a first key image among said group of key images; a key image layout modifying unit for modifying the layout of said group of key images with modifying the size of said first key image; and a key image display modifying unit that reduces the size of a second key image among said group of key images when it becomes impossible to display all the key images belonging to said group of key images simultaneously on said display screen as a result of modifying the size of said first key image. 
   (2) An image processing device comprising: at least two items selected from a group consisting of an image reading device for obtaining image data by reading document images, a printing device for printing the image data; and a transmitting device for transmitting the image data; and a data input device described in (1). 
   (3) A data input method for a data input device for displaying a group of key images on a display screen and when an input designation area is designated on said display screen corresponding to a display area for each key image belonging to said group of key images, entering data assigned to said key image, comprising: a step of modifying the size of a first key image among said group of key images; a step of modifying the layout of said group of key images with modifying the size of said first key image; and a step of reducing the size of a second key image among said group of key images when it becomes impossible to display all the key images belonging to said group of key images simultaneously on said display screen as a result of modifying the size of said first key image. 
   (4) A computer readable recording medium on which a data input program is recorded, said program causing a data input device for displaying a group of key images on a display screen and when an input designation area is designated on said display screen corresponding to a display area for each key image belonging to said group of key images, entering data assigned to said key image, to execute: a step of modifying the size of a first key image among said group of key images; a step of modifying the layout of said group of key images with modifying the size of said first key image; and a step of reducing the size of a second key image among said group of key images when it becomes impossible to display all the key images belonging to said group of key images simultaneously on said display screen as a result of modifying the size of said first key image. 
   (5) A data input device for displaying a first group of key images on a display screen and when an input designation area is designated on said display screen corresponding to a display area for each key image belonging to said first group of key images, entering data assigned to said key image, comprising: a key image size modifying unit for modifying the size of a first key image among said first group of key images; a key image layout modifying unit for modifying the layout of said first group of key images with modifying the size of said first key image; and a key image display modifying unit for displaying a second key image for selecting and designating data to be entered from data assigned to key images belonging to a second group of key images in place of the second group of key images among said first group of key images when it becomes impossible to display all the key images belonging to said first group of key images simultaneously on said display screen as a result of modifying the size of the first key image. 
   (6) An image processing device comprising: at least two items selected from a group consisting of an image reading device for obtaining image data by reading document images, a printing device for printing the image data; and a transmitting device for transmitting the image data; and a data input device described in (5). 
   (7) A data input method for a data input device for displaying a first group of key images on a display screen and when an input designation area is designated on said display screen corresponding to a display area for each key image belonging to said first group of key images, entering data assigned to said key image, comprising: a step of modifying the size of a first key image among said first group of key images; a step of modifying the layout of said first group of key images with modifying the size of said first key image; and a step of displaying a second key image for selecting and designating data to be entered from data assigned to key images belonging to a second group of key images in place of the second group of key images among said first group of key images when it becomes impossible to display all the key images belonging to said first group of key images simultaneously on said display screen as a result of modifying the size of the first key image. 
   (8) A computer readable recording medium on which a data input program is recorded, said program causing a data input device for displaying a first group of key images on a display screen and when an input designation area is designated on said display screen corresponding to a display area for each key image belonging to said first group of key images, entering data assigned to said key image, to execute: a step of modifying the size of a first key image among said first group of key images; a step of modifying the layout of said first group of key images with modifying the size of said first key image; and a step of displaying a second key image for selecting and designating data to be entered from data assigned to key images belonging to a second group of key images in place of the second group of key images among said first group of key images when it becomes impossible to display all the key images belonging to said first group of key images simultaneously on said display screen as a result of modifying the size of the first key image. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a block diagram showing the constitution of an MFP  1   a  according to a first embodiment of the invention. 
       FIG. 2  is a flowchart showing the procedure of data input process of an operating panel unit  14  of MFP  1   a  shown in  FIG. 1 . 
       FIG. 3  is a flowchart showing the procedure of operating screen display process of operating panel unit  14  of MFP  1   a  shown in  FIG. 2 . 
       FIG. 4  is an example of initial screen control information of MFP  1   a  shown in  FIG. 3 . 
       FIG. 5  shows an example of an initial screen displayed on a display  14   a  of control panel  14  of MFP  1   a  based on the initial screen control information shown in  FIG. 4 . 
       FIG. 6  is a screen obtained by enlarging the key image of a size variable key and modifying the layout of the initial screen of display  14   a  shown in  FIG. 5 . 
       FIG. 7  is an example of updated screen control information by further enlarging the size of the key image of the size variable key and modifying the layout of the screen of display  14   a  shown in  FIG. 6 . 
       FIG. 8  is a screen obtained by modifying the layout based on the screen control information of  FIG. 7 . 
       FIG. 9  is a flowchart showing the procedure of operating screen display process of operating panel unit  14  of an MFP  1   b  according to the second embodiment of the invention. 
       FIG. 10  is an example of initial screen control information of MFP  1   b  shown in  FIG. 9 . 
       FIG. 11  shows an example of an initial screen displayed on a display  14   a  of control panel  14  of MFP  1   b  based on the initial screen control information shown in  FIG. 10 . 
       FIG. 12  is an example of updated screen control information by further enlarging the size of the key image of the size variable key and modifying the layout of the screen of display  14   a  shown in  FIG. 11 . 
       FIG. 13  is a screen obtained by modifying the layout based on the screen control information of  FIG. 12 . 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings. 
     FIG. 1  is a block diagram showing the constitution of MFP  1   a  according to a first embodiment of the invention. As shown in  FIG. 1 , MFP  1   a  contains a CPU  11 , a ROM  12 , a RAM  13 , an operating panel unit  14 , an image reading unit  15 , a printing unit  16 , a network interface  17 , and a telephone circuit interface  18 , all of which are interconnected each other via a bus  19  for exchanging signals. 
   CPU  11  controls various parts indicated above and executes various arithmetic processes according to a program. ROM  12  stores various programs and parameters. RAM  13  stores programs and data temporarily as a working area. An operating panel unit  14  consists of a display  14   a , a touch panel  14   b  provided on the screen of display  14   a , a display control unit (not shown), etc. Display  14   a  consists of a liquid crystal display, a CRT and the like, and displays various operating keys and information. Touch panel  14   b  can be of an electronic, electrostatic, optical or ultrasonic type or other types, and detects the information of the position where the panel is touched. When the user designates a key image displayed on the screen of display  14   a , operating panel unit  14  identifies the key image designated through touch panel  14   b  and enters the data assigned to said key image. 
   Image reading unit  15  casts light on a document set on a specified location from a light source such as a fluorescent lamp and the like, converts reflected lights from the document surface into electrical signals with the help of light sensitive devices such as CCD or CIS, and generates image data (bitmap data) from the electrical signals. Image reading unit  15  is also equipped with an automatic document feeder (“ADF”) that transfers a document consisting of multiple sheets one sheet at a time to the specified location so that they can be readed sequentially. Printing unit  16  prints the image data after image processing according to the setup condition. 
   Network interface  17  is an interface to connect with a network for communicating with other devices on the network using standards such as Ethernet.RTM., Token Ring, FDDI, etc. Telephone circuit interface  18  is an interface for connecting MFP  1   a  with telephone channels. 
   MFP  1   a  has a copying machine&#39;s function for copying documents and a conventional facsimile machine&#39;s function for send and receive image data via telephone circuits, as well as, by means of connecting with a network, a scanner&#39;s function for scanning documents and transmitting the image data to other devices on the network and a printer&#39;s function of printing based on printing jobs received from other devices on the network. 
     FIG. 2  is a flowchart showing the procedure of data input process of an operating panel unit  14  of MFP  1   a  in this embodiment. The algorithm shown in the flow chart of  FIG. 2  is stored as a program in ROM  12  of MFP  1   a  and executed by CPU  11 . However, said program can be stored and executed in the display control unit (not shown) in operating panel unit  14 . 
   In  FIG. 2 , MFP  1   a  displays an operating screen containing key images of various operating keys on display  14   a  of operating panel unit  14  (S 101 ), and simultaneously stores the input designation area on touch panel  14   b  corresponding to the display area on display  14   a  for each key image on the operating screen and the data assigned to each key image to RAM  13  (S 102 ). Next, the system waits for the user to designate touch panel  14   b  on the screen of display  14   a  (S 103 : No). When the user designates touch panel  14   b  by designating a key image displayed on the screen of display  14   a , the system detects it through touch panel  14   b  (S 103 : Yes), and detects the position information of the position designated on touch panel  14   b  (S 104 ) If the detected position information is included in the input designation area on touch panel  14   b  corresponding to the display area of the particular key image (S 105 : Yes), a judgment is made that said key image is designated and the data assigned to said key image is entered (S 106 ). 
   Next, the procedure of the operating screen display process on operating panel unit  14  of MFP  1   a , which is the unique feature of this embodiment, will be described.  FIG. 3  is a flowchart showing the procedure of operating screen display process of an operating panel  14  of MFP  1   a . In  FIG. 3 , MFP  1   a  first retrieves the initial screen control information stored in ROM  12  onto RAM  13  (S 201 ), and displays the initial screen on display  14   a  of operating panel unit  14  based on the initial screen control information (S 202 ).  FIG. 4  is an example of initial screen control information of MFP  1   a  in this embodiment. In  FIG. 4 , initial screen control information  21  contains such information as “screen mode,” “key image group,” “key image classification,” “constitutional key image,” “key image data,” “status,” “attribute,” etc. 
   “Screen mode” here means the types of screens that can be displayed on display  14   a , and includes “copy mode” for displaying the copying operation screen, “fax mode” for displaying the facsimile operation screen, “scan mode screen” for displaying the scanner operation screen, “management mode” for displaying the management setup screen, etc. The screen mode is set to the copy mode in initial screen control information  21 , so that the initial screen is the copy operation screen in this embodiment. 
   “Key image group” denotes the type of a key image group constituting of key images having the same kind of functions to be displayed on display  14   a , and includes, depending on the screen mode, “start key,” “ten key,” “size modifying key,” “mode switching key,” “paper size key,” “magnification key,” etc. 
   “Key image classification” denotes the classification of the key images in the operating screen display process depending on the mode of display modification, and includes three classifications; “size variable key,” “basic key,” and “application key.” “Size variable key” allows a key image to have various sizes, so that the user can arbitrarily enlarge or reduce the size of the key image within a specified range by operating the size modifying key. “Basic key” is a key image to be displayed in a fixed size on the same screen no matter how the size of the size variable key is modified. “Application key” is a key image to be displayed in a reduced size, when it becomes impossible to display all the key images simultaneously on the screen due to a size modification of the size variable key. In initial screen control information  21 , the start key is set as a size variable key, the mode switching key, the size modifying key, and the ten key are set as basic keys, while the magnification key and the paper size key are set as application keys. Although the key image classification is assigned to each key image group in this embodiment, it can be so arranged to divide a single key image group into separate groups and assign a plurality of key image classifications to them, or assign a key image classification to each individual key image rather than to a key image group. It can be constituted in such a way as to allow a person to assign each key image group to a specific key image classification arbitrarily, wherein any user, or a person with a specific authority such as an administrator through a control screen protected by a password, can modify or set it by editing the screen control information. 
   “Constitutional key image” denotes the key images that constitute a key image group, while “key image data” denotes the file name of a key image. “Status” denotes the status of a key image on display  14   a  and indicates the size (scale) and the position information of the key image on the screen, etc. “Attribute” denotes information such as whether the size of a key image can be modified, or whether its position can be modified. 
     FIG. 5  shows an example of an initial screen displayed on a display  14   a  of control panel  14  of MFP  1   a  based on the initial screen control information shown in  FIG. 4 . In  FIG. 5 , key images related to start key  41 , mode switching key  42 , size modifying key  43 , ten key  44 , magnification key  45  and paper size key  46 , as well as message display area  47  are displayed in their specified sizes on screen  31  base on initial screen control information  21 . 
   In  FIG. 3 , when the user enters a mode switching instruction by means of designating mode switching key  42  on display  14   a  (S 203 : Yes), screen control information of designated mode stored on ROM  12  is retrieved onto RAM  13  in a similar manner as in step S 201  and S 202  (S 204 ), and displays a screen of designated mode on display  14   a  based on the screen control information thus retrieved (S 205 ). 
   Next, when the user enters an instruction for modifying the size of a size variable key by means of designating size modifying key  43  on display  14   a  (S 206 : Yes), MFP  1   a  calculates the layout of the operating screen when the image size of the size variable key is modified according to the size entered by the user (S 207 ), and makes a judgment whether it is possible to display all the key images to be displayed on the screen simultaneously (S 208 ). If it determines that it is possible to display all the key images on the screen simultaneously (S 208 : Yes), the screen control information is updated by registering the position information of each key image according to the calculated layout to the screen control information (S 211 ), and the operating screen is displayed on display  14   a  based on the new layout modified according to said screen control information (S 212 ) to terminate the operating screen display process. 
   The layout modification of the operating screen due to the size modification of the size variable key in this embodiment will be conducted by adjusting the spacing between each adjacent key image group, i.e., the width of the margin, as long as the vertical and horizontal widths of the screen are not exceeded respectively by the sums of the vertical widths and the horizontal widths of the basic keys and the application keys, which potentially interfere with each other in the vertical and horizontal directions of the screen when the size of the size variable key is modified (if the following formula (I) is satisfied).
 
 K   v ′( x )+Σ K   Bi ( x )+Σ K   Ai ( x )&lt; X  and
 
 K   v ′( y )+Σ K   Bi ( y )+Σ K   Ai ( y )&lt; Y   (I)
 
   wherein X is the horizontal width of the screen, Y is the vertical width of the screen, K v ′ (x) is the horizontal width of the size variable key after the size modification, K v ′ (y) is the vertical width of the size variable key after the size modification, K B  (x) is the horizontal width of the basic key, K B  (y) is the vertical width of the basic key, K A  (x) is the horizontal width of the application key prior to the size reduction, and K A  (y) is the vertical width of the application key prior to the size reduction. 
     FIG. 6  is a screen obtained by enlarging the size of the key image of the size variable key and modifying the layout of the initial screen of display  14   a  shown in  FIG. 5 . Since the sum of the horizontal widths of each key image group of the basic key, i.e., ten key  44 , and the application keys, i.e., magnification key  45  and paper size key  46 , which may interfere with each other in accordance with the enlargement of size variable key, i.e., start key  41 , and the horizontal width of the key image of start key  41  after the size modification does not exceed the horizontal width of the screen  32 , the layout is modified by adjusting the spaces between the key image groups. 
   On the contrary, if it is determined in  FIG. 3  that it is impossible to display all the key images simultaneously on the screen as a result of the layout calculation in step S 207  (S 208 : No), the sizes of the application keys are reduced until it becomes possible to display all the key images (S 209 ), and the layout of the operating screen after the size reduction of the application keys is calculated again (S 210 ). The screen control information is then updated by registering the size, the position information and others of each key image according to the calculated layout to the screen control information (S 211 ), and the operating screen is displayed on display  14   a  based on the new layout modified according to said screen control information (S 212 ) to terminate the operating screen display process. 
     FIG. 7  is an example of updated screen control information by further enlarging the size of the key image of the size variable key and modifying the layout of the screen of display  14   a  shown in  FIG. 6 , and  FIG. 8  is a screen modified according to the screen control information of  FIG. 7 . In  FIG. 7  and  FIG. 8 , since the sum of the horizontal widths of each key image group of a basic key, i.e., ten key  44 , and application keys, i.e., magnification key  45  and paper size key  46 , and start key  41  after the size enlargement exceeds the horizontal width of the screen, the layout is modified by reducing the sizes of each key image group of application keys, i.e., magnification key  45  and paper size key  46  so that all the key images can fit into the screen while maintaining the ratios between the vertical widths and the horizontal widths of the application keys as well as the size ratios between them based on the following formula (II), the result of which is shown in  FIG. 33 .
   K   Aj ′( x )=( X− ( K   v ′( x )+Σ K   Bi ( x ))× K   Aj ( x )/Σ K   Ai ( x )   K   Aj ′( y )= K   Aj ( y )× K   Aj ′( x )/ K   Aj ( x ) or   K   Aj ′( y )=( Y− ( K   v ′( y )+Σ K   Bi ( y ))× K   Aj ( y )/Σ K   Ai ( y )   K   Aj ( x )= K   Aj ( x )× K   Aj ′( y )/ K   Aj ( y )  (II) 
   wherein the symbols X, Y, K v ′(x), K v ′(y), K B (X), K B (y), K A (x), and K A (y) denote the same things as in the formula (I), while K A ′ (x) denotes the horizontal widths and K A ′ (y) denotes the vertical widths of application keys after the size reduction. 
   Although it is shown in the first embodiment described above that the layout of the screen is modified by reducing the sizes of the key images of the application keys while maintaining the layout of each key image and each key image group with modifying the size of the key image of the size variable key, the invention can also be constituted in such a way as to modify the screen layout by modifying the arrangement of each key image or each key image group on the operating screen by means of reducing the size of the key images of the application keys and using the publicly known two dimensional mapping algorithm. 
   Next, the second embodiment of the invention will be described below. MFP  1   b  in the present embodiment has a similar constitution as that of MFP  1   a  in the first embodiment (see  FIG. 1 ) to perform the data input process with a similar procedure in MFP  1   a  (see  FIG. 2 ), so that only the procedure of the operating screen display process, which is the characteristic part of MFP  1   b , will be described. 
     FIG. 9  is a flowchart showing the procedure of operating screen display process of an operating panel  14  of MFP  1   b  in this embodiment. The algorithm shown in the flow chart of  FIG. 9  is stored as a program in ROM  12  of MFP  1   b  and executed by CPU  11 . However, said program can be stored and executed in the display control unit (not shown) in operating panel  14 . 
   In  FIG. 9 , MFP  1   b  first retrieves the initial screen control information stored in ROM  12  onto RAM  13  (S 301 ), and displays the initial screen on display  14   a  of operating panel unit  14  based on the initial screen control information (S 302 )  FIG. 10  is an example of initial screen control information of MFP  1   b  in this embodiment. In  FIG. 10 , initial screen control information  23  contains such information as “screen mode,” “key image group,” “key image classification,” “constitutional key image,” “key image data,” “status,” “attribute,” etc., and these functions are identical to those described in the first embodiment. However, the “application key” in the “key image classification” is a key image to be displayed by changing in a scrolling display key, a pull-down display key and the like when it becomes impossible to display all the key images to be displayed simultaneously on the screen as a result of the size modification of the size variable key. The scrolling display key and the pull-down display key here mean keys to select and designate the data to be entered by means of scrolling and pull-down respectively. In initial screen control information  23 , the start key is set as a size variable key, the mode switching key, the size modifying key, and the ten key are set as basic keys, while the magnification key and the paper size key are set as application keys. Also, the “status” shows the size (scale) and the position information of a key image on the screen when the key image is to be displayed on the screen, and indicates “no display” when the key image is not to be displayed. 
     FIG. 11  shows an example of an initial screen displayed on a display  14   a  of control panel  14  of MFP  1   b  based on the initial screen control information shown in  FIG. 10 . In  FIG. 11 , key images related to start key  41 , mode switching key  42 , size modifying key  43 , ten key  44 , magnification key  45  and paper size key  46 , as well as message display area  47  are displayed in their specified sizes on screen  34  base on initial screen control information  23 . 
   In  FIG. 9 , when the user enters a mode switching instruction by means of designating mode switching key  42  on display  14   a  (S 303 : Yes), screen control information of designated mode stored on ROM  12  is retrieved onto RAM  13  in a similar manner as in step S 301  and S 302  (S 304 ), and displays a screen of designated mode on display  14   a  based on the screen control information thus retrieved (S 305 ). 
   Next, when the user enters an instruction for modifying the size of a size variable key by means of designating size modifying key  43  on display  14   a  (S 306 : Yes), MFP  1   b  calculates the layout of the operating screen when the size of the key image of the variable key is modified according to the size entered by the user (S 307 ), and makes a judgment whether it is possible to display all the key images to be displayed on the screen simultaneously (S 308 ). If it determines that it is possible to display all the key images on the screen simultaneously (S 308 : Yes), the screen control information is updated by registering the position information of each key image according to the calculated layout to the screen control information (S 311 ), and the operating screen is displayed on display  14   a  based on the new layout modified according to said screen control information (S 312 ) to terminate the operating screen display process. 
   The layout modification of the operating screen in accordance with the size modification of a size variable key in this embodiment is identical to what is described in the first embodiment (see  FIG. 6 ) in a case where the sums of the vertical and horizontal widths of the key images of basic keys and application keys that are potentially interfering with each other in the vertical or horizontal direction of the screen in accordance with the size modification of the key image of the size variable key do not exceed the vertical and horizontal widths of the screen respectively (i.e., satisfy the aforementioned formula (I)). 
   On the other hand, if it becomes impossible to display all key images on the screen simultaneously (S 308 : No) as a result of the layout calculation in step S 307  in  FIG. 9 , the application keys are switched from the mode of displaying all constitutional key images to the scroll display key mode (S 309 ), and recalculate the layout of the operating screen after modifying the display of the application key (S 310 ) The screen control information is then updated by registering the position information and others of each key image according to the calculated layout to the screen control information (S 311 ), and the operating screen is displayed on display  14   a  based on the new layout modified according to said screen control information (S 312 ) to terminate the operating screen display process. 
     FIG. 12  is an example of updated screen control information by further enlarging the size of the key image of the size variable key and modifying the layout of the screen of display  14   a  shown in  FIG. 11 , and  FIG. 13  is a screen modified according to the screen control information of  FIG. 12 . In other words, in  FIG. 12  and  FIG. 13 , the sum of the horizontal widths of each key image group of the basic key, i.e., ten key  44 , and the application keys, i.e., magnification key  45  and paper size key  46 , and start key  41  after the size enlargement exceeds the horizontal width of the screen, the layout modification is done by switching the mode of displaying all constitutional key images of the application keys, i.e., magnification key  45  and paper size key  46  to the scroll display key mode in which these constitutions are displayed by scrolling as shown in  FIG. 33 . 
   Although the screen layout is modified by modifying the application keys to the scroll display keys in accordance with the size modification of the key image of a size variable key in the second embodiment, it can also be constituted to modify the application key to the pull down display keys. Also, the invention can be constituted in such a way as to modify the layout by modifying the arrangement of each key image or each key image group on the operating screen by means of modifying the application keys to scroll display keys and pull down display keys while applying the two dimensional mapping algorithm which is known to the public. 
   Although it was shown in the above-mentioned embodiments that any user can modify the size of a size variable key, it can also be constituted to restrict the modification available only to an administrator by means of a password. 
   Moreover, although it was shown in the abovementioned embodiments that the screen control information prior to the layout modification in accordance with the size modification of a size variable key is to be updated with the screen control information after the modification, it is also possible to make each user to select a screen of the user&#39;s preference by allowing the screen control information after the modification to be registered anew. 
   Furthermore, although it was described in the above embodiments that the data input device of the invention is built into an MFP, the invention is not limited to such a case, but rather it can be applied to the data input device of various devices such as printers, digital copying machines, facsimile devices, computers such as installed personal computers, laptop computers, portable terminals such as cellular telephones, PHS.RTM., PDA, electronic pocketbooks, consumer electronics products such as TVs, stereo sets, microwave ovens, refrigerators, and various other devices. 
   The data input device and the data input method according to this invention can be realized by a dedicated hardware circuit for executing the abovementioned steps, or by causing a CPU to executed a program where said steps are described. If the present invention is to be materialized by the latter means, said programs for operating the data input device can be provided by computer-readable recording media such as a floppy.RTM. disk and CD-ROM, or can be provided on-line via a network such as the Internet. In this case, the program recorded on the computer readable recording medium is normally transferred to and stored in a memory device such as ROM and a hard disk. 
   As can be seen from the above, the invention is capable of providing a data input device having a touch panel on the display, showing a plurality of key images on its display screen, and, when an input designation area is designated corresponding to the display area of a key image on said display screen, entering data assigned to said key image; in particular, such a data input device that allows the operator to modify the sizes of specific operating keys arbitrarily and automatically modifies the layout of other keys.