JPS62231985A - Display unit with multiwindow display function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention is applicable to office computers, personal computers, workstations, word processors, DPs, etc.
Regarding the improvement of a display device suitable for use in various data processing devices such as S (data processing system), which has a multi-window display function and a window operation function to move and change the size of each window, especially.

Ability to arbitrarily change the shape of each window, i.e.
The present invention relates to a display device with a function for partially deleting each window.

-ff Specifically, in multi-window display, by adding a function to partially delete each window, when at least two or more windows are displayed overlapping, the display contents of the topmost window can be deleted. and the contents of the overlapping part of the window below it.If you need to refer to the contents of the overlapping part of the two windows, without changing the position or size of the window, The present invention relates to a display device that improves the processing efficiency of a data processing system to which the display device is connected by making the display devices visible at the same time and reducing the burden on an operator when referring to data for parallel processing.

Currency” Rie Traditionally, multi-window display systems.

Used in various data processing devices.

Multi-window display uses CR, which is a physical display device.
This is a display method in which the display screen of a display device such as T is divided into an arbitrary number of sections and separate information is displayed in each section.

FIG. 7 shows an example of a multi-window display.

In the drawings, D1 to D4 are display devices.

In this FIG. 7, in each section of the display device D4 shown on the right side, a plurality of display devices D1 to D3 on the left side are provided.
Multi-window display is performed by displaying any part of the displayed content surrounded by broken lines.

As described above, a display device having a multi-window display function allows a plurality of windows to be opened on one real screen such as a CRT.

The manner in which the windows overlap, the size of the windows, the display portion, the display position of the windows, etc. are changed by operating the control keys on the keyboard.

Such multi-window display is often used when a plurality of interrelated jobs are processed in parallel.

In the case of a multi-window display system, in the display diagram of Figure 7 [04], only one window in each section can be operated by keystrokes, and processing such as keystrokes is performed only for that window. be able to. This window is called an active window, and other windows are displayed to refer to the contents or to monitor the progress of parallel processing, and cannot be used for input.

Next, a conventional display device having a multi-window display function will be described.

FIG. 8 is a functional block diagram showing the main configuration of a conventional display device having a multi-window display function. In the drawing, 1 is a data processing unit, 2A to 2n are first to nth window control units, 21 is a virtual screen buffer memory, 22 is a cursor control unit, and 23 is a cursor address register.

24 is a display partition control unit, 25 is a window management register, 3 is a multi-window control unit, 4 is a keyboard control unit, 5 is a keyboard, 6 is a display data buffer memory, 7
indicates a display device.

If the maximum number of windows that can be displayed on a CRT screen of seven display units is 11, then n window control units are required.

The n window control units, that is, the first to nth window control units 2A to 2n, each include a virtual screen buffer memory 21, a cursor control unit 22, a cursor address register 23, a one display section control unit 24, It is composed of a window management register 25.

Data received from the CPU or the like is accompanied by information indicating in which window the data should be displayed.

Based on this information, the data processing section 1 sends the data to the window control sections 2A to 2n to be sent.

In this case, the data includes not only character data to be displayed, but also cursor control codes and the like.

The character data is stored in the virtual screen buffer memory 21 in the corresponding window control unit 2A to 2n.

Here, among the n virtual screen buffer memories 21,
A case will be explained in which three virtual screen buffers are used.

FIGS. 9(1) to 9(3) are diagrams showing three virtual screen buffer memories and the positions of their cutout windows. Broken lines in the drawings indicate areas to be cut out.

FIG. 10 is an example of a display data buffer memory when displaying data in each cutout area of the virtual screen buffer memory shown in FIGS. 9 (1) to (3) in a multi-window.

Data within the range of broken lines is extracted from the three virtual screen buffer memories shown in FIGS. 9(1) to 9(3) and written to the display data buffer as shown in FIG. 10 for multi-window display.

The extraction position of the virtual screen buffer memory 21, ie, the display section, is indicated by the address.

FIG. 11 is a diagram for explaining addresses of the virtual screen buffer memory 21.

As shown in FIG. 11, the virtual screen buffer memory 21 is given a row address and a column address.

In the virtual screen buffer memory 21 shown in FIG. 9 (1) to (3) above, when data is extracted from the area surrounded by a broken line, the upper left coordinates of that area, that is, the row address and column address. All you have to do is specify.

In multi-window display, in addition to the cutout position, it is also necessary to specify the size of each window and how they overlap.

For this purpose, each window control section 2A to 2n is provided with a window management register 25.

FIG. 12 is a diagram showing an example of a window management register.

As shown in FIG. 12, the window management register contains information such as the window level indicating the order in which each window overlaps, the cutting position of the virtual screen buffer, the vertical and horizontal length indicating its size, and the window position. Each information is stored.

The window level that indicates the order of overlapping of each window is 1 for the window displayed at the top.

Thereafter, the level number increases in the order of 1 overlap to 2, 3.4.

The position of each window on one display data buffer memory 6 is managed by the row and column address of the upper left coordinates of the window (coordinates on the display data buffer memory 6).

The following Figure 13 (1) to (3) are the same as Figure 9 (1) to (3).
10 is a diagram showing a specific configuration of three window management registers when a partial area is cut out from the three virtual screen buffer memories 21 shown in FIG. 10 and written to the display data buffer memory 6 as shown in FIG. be.

FIGS. 14(1) to 14(3) are diagrams showing specific configurations of the same three mask registers.

The display section control section 24 of each of the window control sections 2A to 2n is provided with mask registers as shown in FIG. 14 (1) to (3).

The multi-window control unit 3 is shown in FIG. 13 (1) to (3).
According to the contents of the window management register 25 shown in
Mask information is written to each mask register shown in FIG. 14 (1) to (3).

The mask register has the same size (vertical and horizontal size) as the virtual screen buffer memory 21, and its coordinates, that is, row and column addresses, also correspond to the coordinates of the virtual screen buffer memory 21.

Therefore, if the contents of the mask register determined by a certain row address and column address are "1", the contents of the virtual screen buffer memory 21 at the same row address and column address are transferred to the display data buffer memory 6, and the contents are transferred to the display data buffer memory 6 at II OHg. If there is, it will not be forwarded.

Such transfer to the display data buffer memory 6 is performed every time new data (data received from the CPU) is written to the virtual screen buffer memory 21.
The display data buffer memory 6 always stores the latest data in the virtual screen buffer memory 21.

Note that the contents of the window management registers 25 provided in each of the window control units 2A to 2n are rewritten by instructions from the keyboard, and when the contents are rewritten, the contents of each mask register are also rewritten.

Therefore, data is transferred from the virtual screen buffer memory 21 to the display data buffer memory 6 according to the new contents of the mask register.

For example, when the window level is changed by a keyboard operation, the contents of the mask register are also rewritten accordingly.

In a display device having a multi-window display function, the data of the display section cut out from the virtual screen buffer memory 21 is displayed in a window through the processing described above.

By the way, in multi-window display systems.

In a display state where at least two or more windows are overlapping, there may be a case where, in order to refer to the contents of the windows, it is desired to see the contents of the overlapping and invisible portion of the lower window.

FIG. 15 shows an example of a display screen for explaining the process of referring to the contents of both the upper and lower windows when two or more windows are displayed overlapping each other in a conventional multi-window display system. FIG.

In the drawings, a to C indicate the screens that change due to window resizing and movement processing, UW is the upper window, UW' is the data area that you want to refer to, LW is the lower window, and LW' is the window that you want to refer to. Indicates the data area you want to refer to.

In the case of a conventional multi-window display system, this first
When the user wishes to refer to the data area LW' of the lower window LW on the screen shown in FIG. 5a, the upper window UW is made smaller as shown in the screen shown in FIG. 15b.

After that, move this upper window UW and
5 Display a window on a screen like C in Figure 5.

In this way, you can change the size of the upper window UW,
It is necessary to process the movement.

Moreover, the data area UW' of the upper window UW,
After referring to the contents of the data area LW' of the lower window LW, it is necessary to return to the original window display.

To do this, we now need to perform the reverse process, and on the screen C in Figure 15, move the upper window UW and
The screen is displayed as shown in FIG. 5b, and then the size of the upper window UW is increased to display windows UW and LW as shown in FIG. 15a.

In this way, in conventional multi-window display systems, when windows are displayed overlapping and you want to refer to the hidden contents of the lower window LW and the contents of the upper window UW, This requires a complex combination of multiple processes, such as changing the size of the upper window UW and moving the display positions of the upper and lower windows UW and LW.
There is an inconvenience in that the operator is forced to perform extremely inefficient work.

Therefore, the display device with the multi-window display function of the present invention solves such inconveniences in the conventional multi-window display system, and when two or more windows are displayed overlapping, both the upper and lower When you need to refer to the contents of the upper window, you can quickly and easily delete the overlapping portion of the windows using a window operation that deletes part of the upper window, making it easier to refer to the contents of each window. The purpose is to improve operability by making it possible to

This purpose will become clearer by understanding the operation of changing the window shape by the display device of the present invention.

FIG. 16 is an example of an actual screen screen for explaining the principle of processing for changing the window shape of the display device of the present invention when referring to an overlapping portion of two or more windows. The number in the drawing is the first
This is the same as Figure 5.

Furthermore, the shaded area indicates the deleted portion of the upper window UW.

When referring to the overlapping portion of two or more windows, in the display device having the multi-window display function of the present invention, the upper window UW of 5 is referred to as shown in FIG.
, delete the diagonally shaded portion that covers the portion LW' to be referenced in the overlapping portion of the lower window LW. The same applies to the case of two or more windows.

The only operations necessary for this purpose are to instruct deletion through window operations, and to instruct the window to be deleted and its deletion area.

Note that even if two or more windows overlap many times, the same operation can be repeated sequentially starting from the upper window.

In this way, the present invention aims to provide a display device with extremely good operability.

To this end, the present invention includes a display data buffer memory that stores display data of a physical display device, at least two virtual screen buffer memories, and a display data buffer memory that stores data in a partial area of the virtual screen buffer memory. A means for cutting out as display data, a window management information storage means for storing management information regarding the cut out area, and a combination of data of each area cut out from the virtual screen buffer memory and outputting the combined data to the display data buffer memory. and a means for
In a display device having a multi-window display function and a window operation function for moving and resizing each window, in order to add a deletion function to the window operation function, a deletion area specifying means for specifying a deletion area of each window. and a window management information retrieving means for retrieving the management information of the corresponding window from the window management information storage means in response to an instruction input from the deletion area instructing means; and window management information creation means for creating window management information in a shape excluding the deleted portion.

Next, embodiments of the display device having a multi-window display function of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the main configuration of a display device having a multi-window display function according to the present invention. In the drawing, 31 is an input device;
32 is a window display control section, 33 is a screen display section, 34
35 is an operation command specification section, 35 is an operation command list deletion section, 36 is a window operation specification section, 37 is an operation command list output section, 38 is a display device, 41 is a window specification section, 42 is a window search section, 43 is the window I
D storage section, 44 a window management data area, 45 a rectangular area specification section, 46 a window information reading section, 4
7 is a window information changing section.

48 indicates a window information writing section.

In FIG. 1, the parts numbered in the 30s from 31 to 38 are parts that have basically the same configuration as the conventional display device, and each part realizes the deletion function added to the display device of the present invention. are shown with numbers in the 40s from 41 to 48.

First, we will discuss the window management data used for the deletion function that changes the window shape. This window management data is stored in the window management data area 44.

This window management data area 44 corresponds to the window management register 25 in FIG. 8, and one is provided for each window.

FIG. 2 is a diagram showing an example of a storage state of window management data in the window management data area 44 of the display device shown in FIG.

As shown in FIG. 2, the window management data area 44 is composed of a window management table at the left end and an actual window size management table at the right.

The window management table contains the "window level" which indicates the order in which windows overlap, the "virtual screen cutout size" which indicates the size of the virtual screen memory displayed in the window, and the size displayed on the real screen. The following information is stored: a "window virtual size" that indicates the basic size of the window, and a "window real size pointer" that is a pointer to the window real size table shown on the right.

Furthermore, the window real size management table is the same as the "window virtual size" before being deleted, and only one real size management table is required for one window.

However, when a deletion operation that changes the window shape is performed to delete a part of the area from one window, the shape of the display area that is not deleted becomes a collection of rectangles.

That is, the display area after the shape change can be expressed as a plurality of rectangles each divided into rectangles, and information on each of these rectangles may be managed as a series of information.

Therefore, in each of the window actual size management tables shown on the right side of FIG. 2, information about the plurality of rectangles that make up the display area after the shape change is stored.

Store one of each and connect them in a chain.

Each window real size management table in Figure 2 contains information about the window real size (1 to m) and the "window real size pointer" which is a pointer to the window real size table shown to the right of the window shape. The number m of rectangles required to express the changed display area is stored. In the [Window Actual Size Pointer] of the last Window Actual Size Management Table, there is information indicating 'j4'.
o”.

As described above, in the display device of the present invention, by using the window management data area 44 configured as shown in FIG. 2, a plurality of rectangular areas corresponding to changes in the shape of the window are managed. .

Next, a process for changing the shape of a window in the display device having a multi-window display function according to the present invention will be described.

FIGS. 3(1) to 3(4) are diagrams for explaining the operating procedure when changing the shape of the window in the display device of the present invention, and are diagrams showing the display state of the actual screen screen at the time of each operation. K in the drawing indicates a cursor.

When a window operation is specified using the input device 31 shown in FIG. 1, a display as shown in FIG. 3 (1) is displayed on the actual screen.

That is, a list of operation commands is displayed, and a selection is required as to which function of the multi-window to operate. Note that the operation commands for movement and size are the same as in the conventional case described above with reference to FIG. 15, and are commands for moving the window and changing the size of the window.

Here, if you select the delete command from the operation command list and give an input instruction, the operation command list will disappear from the screen due to this input instruction, and the single screen display will be
It is changed as shown in FIG. 3 (2).

This explanation is for deleting a rectangular area of a window, and specifying the window you want to operate on.

When specifying this window, select it using the window number used as management information. This third
In the display state shown in FIG. 2, first, specify the window to be used for rA operation.

Then to change the shape of that window.

All you have to do is specify two diagonal points in the rectangular area you want to delete.

To do this, the cursor K is moved to the upper left point of the window to be deleted using a pointing device or the like of the input device 31, and one point in the rectangular area is designated.

When this one point instruction is completed, the cursor K is moved to the lower right point of the window and one point in the rectangular area is specified. Therefore, 1 display screen is.

The result will be as shown in Figure 3 (3).

If deletion is instructed in the screen state shown in FIG. 3(3), the diagonally designated rectangular area of the upper window is deleted and displayed as shown in FIG. 3(4).

As described above, according to the display device of the present invention, a window operation for changing the shape of a window, that is, a deletion operation is performed by inputting a deletion command in the display state of the operation command, selecting the window to be operated, and This can be done with a very simple operation of specifying the area to be deleted.

Such window shape changing processing is performed in the following manner in the display device having a multi-window display function according to the present invention shown in FIG.

FIG. 4 is a flowchart showing a process for changing the shape of a window in the display device having a multi-window display function of the present invention shown in FIG.

When a window operation is instructed from the input device 31 in FIG. 1, the operation command list output unit 3
7. The window display control section 32 and the screen display section 33 operate to display an operation command list as shown in FIG. 3(1) on the screen of the display device 38.

In the display state shown in FIG. 3(1), when the operation command area deletion is selected, the operation command list deletion section 35 operates under the control of the operation command designation section 34, and the operation command list is deleted. A screen like that shown in Figure (2) appears, and the rectangular area deletion mode is set.

Next, in the display state shown in FIG. 3(2), when a window to be processed is designated from the input device 31, the window designation section 4
The information is given from 1 to the search section 42 of the window,
Regarding the window management table of the window management data area 44 that manages each window, the upper left position of the input window is compared to search whether the designated window exists or not.

If a matching window exists as a result of this comparison, the ID (index data) of that window is stored in the window ID storage section 43.

Through such operations, management data of the window to be deleted can be obtained.

Next, as shown in FIG. 3(3), the cursor K is moved to the upper left and lower right points of the deletion area of the window to designate a rectangular area.

This rectangular area designation input is received from the rectangular area designation section 45.
The window information is given to the window information reading section 46.

The window information reading unit 46 reads the window ID stored in the window ID storage unit 43, reads the information of the corresponding window from the management table in the window management data area 44, and outputs it to the window information changing unit 47. do.

In the window information changing section 47, the rectangular area specifying section 45
Information on the corresponding window is read from the management table in the window management data area 44 based on the input data specifying the rectangular area from , that is, the information on the upper left point and the lower right two points of the deletion area.

Change the window information to the two new rectangular areas.

The changed window information is written to the window actual size management table in the window management data area 44 by the window information writing unit 48.

With this operation, the rectangular area deletion process for the window to be deleted is completed.

The window display control unit 32 uses the window management table in the window management data area 44 to create screen data for a new window.

The created screen data is transferred to the screen display section 33.
A new window in which the designated rectangular area has been deleted is displayed on the screen of the display device 38, as shown in FIG. 3(4).

5(1) and (2) show an example of the correspondence between the multi-window display state and the management table of the window management data area 44 when changing the window shape in the display device of the present invention. In the figure, (1) shows a virtual screen screen and the corresponding real screen screen, and (2) shows information on the management table of the window management data area 44.

Generally, in a display device that has a multi-window display function, the information for each window is divided into two areas, the upper left and lower right of the rectangular area.
It is managed by the position of the points.

Therefore, in order to display a rectangular (including square) window as shown in Figure 5 (1), window information as shown in Figure 5 (2) can be used. If the area to be deleted is also processed in rectangular units, window display can be easily controlled.

However, it is clear that the shape of the region to be deleted does not necessarily have to be such a rectangular shape, and may be any other shape.

In the above example, the case where two windows are displayed is described, so by deleting a partial area of the upper window in rectangular units only once, the contents of the desired position of the lower window can be deleted. can be referred to.

However, even when two windows are displayed, depending on the relationship between the display positions of the contents of the upper and lower windows, or when three or more windows are displayed, the deletion process for each window may be One time is not necessarily enough.

In such a case, the process of deleting a partial area of each window will be performed multiple times in units of rectangles. In this case as well, the shape of each window after deletion processing can be expressed and managed as a set of small rectangular areas. Namely.

As shown in FIG. 2, 1 m actual size management tables may be used to store the required number of management information for each rectangular area as a series of information.

Note that if you want to return the display of a window whose rectangular area has been deleted, as shown in Figure 3 (4), to the original display state of one window as shown in Figures 3 (1) and (2), the window Since the information is held as is in the window management table in the window management data area 44, it is possible to quickly restore the display by simply inputting an instruction to return to the original display.

In this way, the display device having the multi-window display function of the present invention can display images in the overlapping area of two or more windows by simply specifying the window to be deleted and specifying the rectangular area in which to perform the deletion process. You can easily refer to the contents.

FIGS. 6(1) and (2) are processes for comparing the operability of the conventional method and the method using the display device of the present invention regarding window operations when referring to the overlapping portion of two or more windows. In each flow example, (1) shows the conventional method, and (2) shows the method using the display device of the present invention.

In the case of the conventional multi-window display system 11,
As shown in FIG. 6(]), complicated processing is required.

On the other hand, in the display device having the multi-window display function of the present invention, the overlapping portion of two or more windows is deleted and the shape is changed by a partial process as shown in FIG. 6(2). It is possible to do so.

Therefore, according to the display device having the multi-window display function of the present invention, it becomes possible to refer to the contents of the overlapping portions displayed in each window extremely easily, and the operability is significantly improved.

As described above in detail, the display device of the present invention includes a display data buffer memory that stores display data of a physical display device, at least two virtual screen buffer memories, and one of the virtual screen buffer memories. means for cutting out data of the partial area as display data; and window management information storage means for storing management information regarding the cut out area.

and means for combining the data of each area cut out from the virtual screen buffer memory and outputting it to the display data buffer memory, a multi-window display function, and a window operation function for moving and changing the size of each window. In the display device, in order to add a deletion function to the window operation function, a deletion area instructing means for instructing a deletion area of each window, and an instruction input from the deletion area instructing means to delete from the window management information storage means. Window management information retrieving means for retrieving management information of a corresponding window, and window management information creation means for creating window management information in a shape excluding the deletion portion instructed by the deletion area instructing means for the management information of the retrieved window. , and are provided.

Part of Shyness Therefore, according to the display device having the multi-window display function of the present invention, when at least two or more windows are displayed overlapping each other, the display contents of the upper window and the window below it are If you need to refer to the contents of the overlapping and invisible parts of the window, you can quickly and easily change the shape of the upper window arbitrarily by using the partial deletion function of each added window. This makes it possible to simultaneously view the contents of the overlapping portions of two windows at any time.

Moreover, when referring to data during parallel processing, there is no need to perform complicated window operations to move or change the size of windows, as in the past, significantly reducing the burden on the operator.

A display device with good operability can be obtained.

As a result, the processing efficiency of the data processing system to which the display device of the present invention is connected is also improved.

In particular, when you want to refer to the contents of an area where three or more windows overlap, if you delete the overlapping area of each window in rectangular units, the degree of freedom in the area to be deleted will increase, and Information on each window can also be easily processed.

Furthermore, it is extremely easy to restore the display of a partially deleted window to its original display state, and from this point of view, the operability is also extremely high.
Many excellent effects can be achieved.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the main configuration of a display device having a multi-window display function according to the present invention, and FIG. 2 is a window management data area of the display device shown in FIG. 1. FIGS. 3(1) to 3(4) are diagrams illustrating an example of the storage state of window management data in 44, and FIGS. A diagram showing the display state of the actual screen screen at the time of each operation. FIG. 4 is a flowchart showing a process for changing the shape of a window in the display device having a multi-window display function of the present invention shown in FIG. FIGS. 5(+) and (2) show a specific example of the correspondence between the multi-window display state and the management table of the window management data area 44 when changing the window shape in the display device of the present invention. In this figure, (1) is a virtual screen screen and the corresponding real screen screen, (2) is a report on the management table of the window management data area 44, and (1) and (2) are two In each of the processing flow examples for comparing the operability of the conventional method and the method using the display device of the present invention regarding window operations when referring to the overlapping portion of windows, (1) is the conventional method. , (2) is a method using the display device of the present invention. FIG. 7 is a multi-window display example, FIG. 8 is a functional block diagram showing the main part configuration of a conventional display device having a multi-window display function, and FIGS. 9 (1) to (3) are: FIG. 10 is a diagram showing the positions of three virtual screen buffer memories and their cut-out windows. An example of the display data buffer memory when displaying, FIG. 11 is a time for explaining 71 heres of the virtual screen buffer memory 21, FIG. 12 is an example of the window management register, and FIG. 13 (1) to ( 3) is a case where a partial area is cut out from the three virtual screen buffer memories 21 shown in FIGS. 9(1) to (3) and written to the display data buffer memory 6 as shown in FIG. The figure which shows the concrete structure of three window management registers. FIGS. 14(1) to 14(3) are diagrams showing specific configurations of three mask registers. FIG. 15 shows an example of a display screen for explaining the process of referring to the contents of both the upper and lower windows when two or more windows are displayed overlapping each other in a conventional multi-window display system. FIG. 16 is an example of an actual screen screen for explaining the principle of processing for changing the shape of a window of the display device of the present invention when referring to an overlapping portion of two or more windows. In the drawing, 31 is an input device, 32 is a window display control section, 33 is a screen display section, 34 is an operation command designation section, 35 is an operation command list deletion section, 36 is a window operation specification section, and 37 is an operation command list table. An output section, 38 is a display device, 41 is a window specification section, 42 is a window search section, 43 is a window ID storage section, 44 is a window management data area, 45 is a rectangular area specification section, 46
47 is a window information reading unit, 47 is a window information changing unit, and 48 is a window information writing unit. Ritsu 4 Zushin 3 Zuama 9 (21 Material 10 Figure 11 Ryo de Shiiritsu 11 Zuzai 14 Figure

Claims (1)

[Claims] a display data buffer memory for storing display data of a physical display device; at least two or more virtual screen buffer memories; means for cutting out data in a partial area of the virtual screen buffer memory as display data; a window management information storage means for storing management information regarding the displayed area; and means for combining data of each area cut out from the virtual screen buffer memory and outputting the combined data to the display data buffer memory; and a window operation function for moving and resizing each window, the display device includes a deletion area specifying means for specifying a deletion area of each window, and the window management information is inputted from the deletion area specifying means. window management information retrieval means for retrieving management information of a corresponding window from a storage means; and window management for creating window management information in a shape excluding the deletion portion instructed by the deletion area instructing means for the management information of the retrieved window. A display device characterized in that a deletion function consisting of information creation means is added to the window operation function.