JP2003067380A - Display, method of displaying drawing, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display respective bodies shown in plural drawing informations with a display mode recognized easily by a user. SOLUTION: A direction of the each body shown in the each drawing information is detected by executing general image processing (edge detection processing or the like) to the drawing information correlated to a document, and a direction when a structure is displayed based on three-dimensional CAD information is controlled to be made consistent with the direction detected hereinbefore. The bodies shown in the drawing informations and the drawing-direction- regulated structure based on the three-dimensional CAD information are displayed on the same image plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of display devices for displaying various types of drawing information.

[0002]

2. Description of the Related Art Conventionally, various kinds of information retrieval using a computer have been carried out, and prior art research regarding industrial property rights such as patents and utility models has been actively conducted even in the field of technological development. .

[0003]

However, in the prior art search that has been conventionally performed, an appropriate search word or search formula is prepared every time a new search target is generated, and an enormous number of documents in the database are searched. Need to investigate. For this reason,
The search accuracy varies depending on the search worker, and the number of man-hours required for the search work is also a problem, and some means by which anyone can easily perform the quick search work is required.

Further, since the drawings included in the documents found by the search are expressed in various directions and modes (cross section, perspective view, plan view, etc.), the objects expressed in the drawings are to be investigated. It is not easy to compare with.

Therefore, an object of the present invention is to provide a display device for displaying each object represented by a plurality of drawing information in a display mode that can be easily recognized by a user, a drawing display method thereof, and a computer program.

[0006]

In order to achieve the above object, a display device according to the present invention is characterized by the following configurations.

That is, based on the first drawing information (for example, the drawing information included in or associated with the document information), the detecting means for detecting the direction of the first object represented in the drawing information, and 3 When displaying the second object represented by the three-dimensional drawing information (for example, three-dimensional CAD information), the second object is displayed.
Display control means for controlling the display mode so that the direction of the object on the display screen is substantially the same as the direction of the first object detected by the detection means.

Further, for example, the display control means may select the first object from the second objects displayed on the display screen.
It is preferable to search for a part similar to or corresponding to the object and highlight the part corresponding to the search result.

In a preferred embodiment, the display control means may display the first object on the same display screen when displaying the second object.

Further, for example, the second object represented in the three-dimensional drawing information is a solid model, and the display control means displays the first and second objects on the same display screen. When the aspect of the first object represented in the first drawing information is a cross-sectional shape, the solid model may be displayed in a state of being expanded to the cross-sectional shape.

It is to be noted that the same object is achieved by a computer-readable storage medium in which a program code for realizing a display device having each of the above-described configurations and a corresponding drawing display method by a computer and the program code is stored. Is also achieved.

[0012]

According to the present invention described above, a display device for displaying each object represented in a plurality of drawing information in a display mode that is easy for a user to recognize, a method for displaying the drawing, and a computer program are provided. Will be realized.

That is, according to the inventions of claims 1 and 7, the dimension information of the drawn object, such as the drawing information (claim 4) included in or associated with the first object (claim 4). And drawing information not including connection information) and the second object (three-dimensional drawing information such as three-dimensional CAD information: claim 3) are different kinds of drawing information, and the directions of the expressed objects are different. Even when the second object is displayed, however, the direction substantially the same as the direction of the first object on the screen is adjusted, so that the user can easily recognize it.

According to the second aspect of the invention, since the highlighting is performed, the user can easily recognize the corresponding parts between the first object and the second object.

Further, according to the invention of claim 5, the first object and the second object are displayed on the same display screen, so that the convenience for the user can be improved.

Generally, as a characteristic of human thought,
It is not easy to compare an object drawn in a sectional view with another object drawn three-dimensionally. On the other hand, according to the sixth aspect of the invention, the solid model includes not only the outer shape of the object but also the arrangement information between a plurality of members forming the object and various attribute information. By utilizing the fact that the shape of the first object is a cross-sectional shape by utilizing the fact that it can be easily expanded to the cross-sectional shape in the arbitrary plane above, the second object, which is a solid model, is automatically expanded into a cross-sectional shape. To be done. This makes it easier for the user to compare the first object and the second object.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings as an embodiment in which the present invention is applied to an information retrieval system for conducting a literature search on industrial property rights such as patents and utility models.

FIG. 1 is a system configuration diagram of the information retrieval system in this embodiment.

In the figure, the development department is provided with a user terminal 1 and the intellectual property department is provided with a user terminal 2.
It is connected to the communication network 3. User terminal 1,
For 2, a general computer that can access the database via a communication line can be used,
Detailed description of the configuration in this embodiment will be omitted.

4 is a CAD (Computer aided Design) / CAE (Computation) targeting existing products or products under development.
3D CAD drawings (3D CA) such as solid models designed using software
D information) and PLD (Programmable Logic Device)
It is a CAD / CAE database that stores design information such as control block diagrams of various control systems realized by utilizing the above.

Reference numeral 5 is a search word (keyword) for document search.
Is a search replacement word database in which a plurality of are stored. In this database, one word / phrase (word or a phrase consisting of a plurality of words) is stored in association with another word / phrase having substantially the same meaning as the word / phrase. For example, the word "car" is associated with a plurality of words such as "vehicle", "car", "car", "car", and "vehicle", "car", "autom".
Words in different language formats such as "obile" are also associated.

Reference numeral 6 denotes a past technical research material database in which information such as search words, search results, and extracted documents used in the technical research conducted in the past is stored.

Reference numeral 7 is an industrial property literature database in which a plurality of documents (specifications, etc.) relating to industrial property rights such as patents and utility models are stored.

Reference numeral 8 is a technical paper database in which a plurality of various technical papers are stored.

In the present embodiment, among the above-mentioned plurality of databases, databases 4 to 6 are under the control of a certain company (company), and databases 7 and 8 are external to the public. Database.
Therefore, as the communication network 3, it is possible to use a currently common one including a LAN environment such as an intranet provided in a company and a general-purpose communication environment using a public line or the Internet.

Next, the overall configuration of the information search function executed by the user terminal 1 used by the person in charge of the development department (user) will be described. The similar information search function may be executed by the user terminal 2 used by the person in charge of the intellectual property department.

FIG. 2 is a block diagram showing the overall configuration of the information search function in this embodiment, which is the C of the user terminal 1.
A software program executed by PU (not shown)
It is an explanatory view roughly classified and expressed for every functional unit.

The information retrieval function in this embodiment has an automatic retrieval control unit 11 and a document retrieval unit 12 as shown in FIG.
Composed of and.

In the automatic search control unit 11, "CAD /
The CAE data control unit "responds to the user's selection operation.
Design information (three-dimensional CAD) including at least one object (member, structure, etc.) from the CAD / CAE database 4
Drawing, control block diagram) is read to the user terminal 1.
The "CAD / CAE data control unit" may also extract a different part between the object selected by the user and included in certain design information and the corresponding part of the object included in other design information. it can.

The "search word setting section" uses the attribute information associated with the design information read from the CAD / CAE database 4 for the object selected by the user, and indicates the object. Is extracted, and another word having substantially the same meaning as the extracted word is read from the search replacement word database 5 to the user terminal 1.

The "sentence conversion unit" is for searching for the object selected by the user based on the arrangement information, connection information, and attribute information associated with the design information read from the CAD / CAE database 4. Using the words and phrases read from the replacement word database 5, the form of the drawing represented by the design information is converted into a sentence.

Further, the “search word setting unit” generates a search formula for search based on the sentence obtained by the “sentence conversion unit” and passes the generated search formula to the document search unit 12.

Then, the "search result control unit" is used to search the search result information by the document search unit 12, the search formula used, and the CA.
The design information read from the D / CAE database 4 is transferred to the user terminal 2 in the intellectual property department, for example, via the communication network 3.

Next, the document retrieval unit 12 is the outside retrieval unit 12
A and the in-house search unit 12B.

In the outside search section 12A, the "reference search section" refers to the industrial property reference database 7 and / or the technical paper database 8 using the search formula obtained from the "search word setting section". With, the documents matching the search formula are searched. The search expression and the search result are
It is passed to the "search result control unit".

Then, in the in-house search section 12B, the "document search section" uses the search formula obtained from the "search word setting section" to refer to the past technical research material database 6 to perform the search. Search for documents that match the formula or past technical research information. The search formula and the search result are passed to the “search result control unit”.

Next, details of the processing of the above-described automatic search control unit 11 will be described.

4 to 6 are flowcharts showing the search control processing executed by the user terminal 1 in this embodiment, and show the processing procedure by the automatic search control unit 11.

First, in FIG. 4, step S1 and step S2: Design information (3) including at least one object (member, structure, etc.) is read from the CAD / CAE database 4.
It is determined that the selection operation for reading the three-dimensional CAD drawing, the control block diagram) is performed by the user (step S
1) When the selection operation is performed, the corresponding design information is read out to the user terminal 1, and the drawing represented by the design information is displayed on the display (step S).
2).

Steps S3 and S5: It is judged whether or not a predetermined operation for starting the document search is performed (step S3), and if the predetermined operation is not performed, it is displayed on the display in step S2. Other processing such as design support processing using CAD / CAE software is performed on the drawing that is being processed (step S
5).

Step S4, Step S6: Step S
When it is detected that the predetermined operation has been performed in the determination of 3, the pointing device such as a mouse is selected from the plurality of objects constituting the object shown in the drawing displayed on the display. By using it, it is determined whether or not the desired object is selected by the user (step S4), and when the selection operation is performed, it is determined whether or not the predetermined operation for starting the search is performed by the user. (Step S6).

FIG. 7 is a diagram exemplifying a state in which an object to be searched is selected in the three-dimensional CAD drawing displayed on the display based on the design information read from the CAD / CAE database 4. In the figure, members A, B, C and D indicated by diagonal lines are selected as objects to be searched.

On the other hand, FIG. 14 is a diagram exemplifying a state in which an object to be searched is selected in the control block diagram displayed on the display based on the design information read from the CAD / CAE database 4. , In the figure,
The shaded blocks CA2 to CA7 and the input signal terminals N and Tp are selected as objects to be searched.

In the step S4 described above, the configuration has been described in which the user appropriately selects the object to be searched in the three-dimensional CAD drawing or the control block diagram displayed on the display based on the design information. The configuration is not limited to this. For example, when the user configures a plurality of design information items from the CAD / CAE database 4, it is included in the selected design information items and other design information items. A different portion may be automatically extracted for the corresponding portion of the target object, and a member (block) included in the extracted portion may be automatically set as the target object of the search target. In this case, the search processing time can be shortened.

Step S8: It is judged whether the currently selected design information is a hardware drawing (structural drawing) or a control block diagram, and if it is a hardware drawing, step S9.
If it is a control block diagram, the process proceeds to step S10.

Step S9: When the design information read out in step S1 is three-dimensional CAD information, the three-dimensional CAD information is a so-called solid model in the present embodiment and constitutes the drawn structure. Regarding the plurality of members to be arranged, arrangement information (coordinate information in a predetermined coordinate system) of the plurality of members, name, material, fixing method
Attribute information such as connection method, support method, and annotation text is associated. Therefore, the user terminal 1 performs step S6.
When a predetermined operation for starting the search is detected in step S9, the words included in the attribute information of the member selected as the search target object are extracted in step S9 as illustrated in FIG. It is temporarily stored in a storage medium (not shown) or the like.

Further, in step S9, the arrangement information of the member selected as the object (including the connection information with other members arranged around the member) and the words and phrases regarding each member extracted as shown in FIG. Based on the above, a sentence representing the display mode of each member shown in the drawing is generated as illustrated in FIG. 9, and is temporarily stored in a storage medium such as a RAM (not shown).
In the example shown in FIG. 9, sentences describing the material, the positional relationship, the supporting method, and the like of the member A, the member A and the member B, the member A and the member D, and the like are shown.

In this embodiment, the logical expression (AεB, A∨B, A) is used for the conversion into the text in step S9.
<B, A ≦ B, etc., where A and B include conversion to members).

Step S10: When the design information read out in step S1 is a control block diagram, the control block diagram shows a plurality of blocks constituting the drawn control system, and between the plurality of blocks. Connection information (input / output allocation information) and attribute information such as name, function, and annotation text are associated with each other. Therefore, when the user terminal 1 detects a predetermined operation for starting the search in step S6, the user terminal 1 sets the word / phrase included in the attribute information for the block selected as the search target object in step S10 as shown in FIG. The data is extracted as illustrated in FIG. 1 and temporarily stored in a storage medium such as a RAM (not shown).

Further, in step S10, a sentence representing the display mode of each block shown in the drawing is based on the connection information of the block selected as the object and the words and phrases relating to each block extracted as shown in FIG. Is generated as illustrated in FIG. 16 and is temporarily stored in a storage medium such as a RAM (not shown). In the example shown in FIG. 16, sentences describing the signal name, sampling setting, input / output (connection) relationship, etc. are shown for the input signal terminal N and the block CA1, the input signal terminal Lp and the block CA1, and the like.

In the preferred embodiment, in steps S9 and S10 described above, by referring to the search replacement word database 5 when extracting the word / phrase of the object, one word / phrase extracted from the drawing is substantially the same. It is good to extract other words that have meaning.

In step S9 and step S10 described above, when extracting the word / phrase of the object, by referring to the replacement word database for retrieval 5, a language format different from one word / phrase extracted from the drawing (for example, Japanese It is advisable to extract sentences (from English to English) so that sentences in various language formats can be extracted to improve convenience.

In step S9 and step S10 described above, a database is prepared in advance in which the sentence patterns of a plurality of basic sentences are associated with typical phrases that will be set. It may be configured to be referred to when converting a phrase into a sentence.

Next, in FIG. 5, step S11 to step S13: based on the sentences generated as illustrated in FIG. 9 or FIG. 16, the search expressions illustrated in FIG. 10 or FIG. Material database 6, industrial property literature database 7 and technical paper database 8
Is generated to search (step S11, step S1
2) The generated search formula is passed to the document search unit 12 (step S13).

In generating the retrieval formula, a plurality of types are obtained by adding priorities (first to third candidates) in accordance with the number of identical words included in the sentences generated in steps S9 and S10 described above. And good. In this embodiment,
Since the form of the drawing showing the object is converted into not only one sentence but a plurality of types of sentences, it is possible to realize a more accurate search operation by using the extracted plurality of types of sentences.

Here, the document search processing performed by the document search unit 12 will be described. FIG. 3 is a flowchart showing a document search process executed by the user terminal 1 in the present embodiment, and represents a processing procedure by the outside search unit 12A and the in-house search unit 12B.

In the figure, Step S51, Step S52: When the document search word and the search formula are acquired from the automatic search control unit 11 (Step S51), the past technical research materials are obtained based on the acquired information. The search is executed by appropriately referring to the database 6, the industrial property literature database 7, and the technical paper database 8 (step S52).

Step S53 to Step S55: Judge the search result in Step S52 (Step S5
3) If there is a document extracted from the past technical research material database 6, the industrial property literature database 7, or the technical paper database 8, at least information that can identify the document is displayed on the display (step S54). ), If the document cannot be extracted, a guidance to that effect is displayed (step S55), and step S5.
Return to 1.

Returning to the explanation of FIG. Step S14,
Step S15: When the search result is input from the document search unit 12 (step S14), the number of documents extracted corresponding to the search formula for each of the priorities (first to third candidates) obtained earlier is displayed. Yes (step S15).

Steps S16 and S17: When any of the candidates (search formula) is selected by the user (step S16), a list of documents corresponding to the selected candidates is displayed as shown in FIG. Yes (Step S
17). In the example shown in FIG. 11, it is shown that there are no documents that could be extracted in the search result by the first candidate search formula, and that the documents could be extracted in the second candidate and subsequent search formulas. ing.

Step S18 to Step S20: When any one of the documents displayed in the list is selected by the user (step S18), information on the selected document (for example, patents or utility models) is displayed. The specification data, which is linked to the reference drawing information, is read into the user terminal 1 (step S19), and the document is displayed on the display based on the read document information (step S20).

Next, in FIG. 6, step S21, step S22: It is judged whether or not the selection operation for displaying the drawing is performed in the document displayed in step S20 (step S21), and the process proceeds to step S1. If the read design information is three-dimensional CAD information,
It is determined whether or not the user has performed a predetermined operation for automatically adjusting the direction of the structure represented by the three-dimensional CAD information (step S22). Then, step S21
If no operation is performed in step S22, the process proceeds to step S27.

Steps S23 and S24: The information of the drawing selected in step S21 is read into the user terminal 1 (step S23), and the drawing of the drawing is selected from the documents being displayed as illustrated in FIG. Name (drawing number)
A sentence containing a certain unit (for example, one column in the specification,
Selection is made in units of claims (step S24).

Step S25: The direction of the object represented in the drawing information is detected by performing general image processing (edge detection processing etc.) on the drawing information read in step S23, and the detected direction is detected. The orientation of the structure based on the three-dimensional CAD information read in step S1 is controlled so as to be substantially in the same direction.

Step S26: The object represented in the drawing information read in step S23 and the structure based on the three-dimensional CAD information in which the drawing direction is adjusted in step S25 are displayed on the same screen as shown in FIG. To display. This allows the user to easily recognize the corresponding part between the two objects displayed on the display.

At this time, it is advisable to highlight the part similar to or corresponding to the previously set object to be searched by changing the display color or enlarging the display. The region to be highlighted may be determined, for example, according to the number of appearances of the word / phrase included in the sentence of the predetermined unit selected in step S24. In the examples shown in FIGS. In response to the selection of the words “roof” and “roof rail” from the words included in the sentence, the display screen example shown in FIG. 13 includes a roof and a roof rail in the structure based on the three-dimensional CAD information. A rectangular frame is displayed for emphasis. Here, even when the terms "roof" and "roof rail" are not directly set as the member names in the three-dimensional CAD information, in the present embodiment, those terms are used as the search key for the search. By referring to the replacement word database 5 for words, it is possible to search for a corresponding word / phrase (for example, “roof” with respect to “roof”), so that appropriate highlighting is possible.

In step S26, step S24
It is good to display the sentence selected in.

The highlighting function described above is executed according to the selection operation by the user when the sentence of the predetermined unit selected in step S24 is the "claim" portion of the specification. It may be configured to.

Further, in the function of displaying the drawing extracted from the document and the drawing information of the survey object together, the three-dimensional CAD
Not only the structure represented by the information is targeted, but the skeleton diagram of the drive system of the vehicle may be targeted.

Generally, as a characteristic of human thought,
It is not easy to compare an object drawn in a sectional view with another object drawn three-dimensionally. In that respect, three-dimensional CA
The so-called solid model as D information includes not only the outer shape of an object, but also layout information between a plurality of members that make up the object and various attribute information. Can be easily deployed.
Therefore, in the present embodiment, when the drawing extracted from the document is a cross-sectional view of the object, the structure represented by the solid model is automatically expanded into the cross-sectional shape. This allows the user to easily compare the structures of the two objects on the display screen of FIG.

Step S27, Step S28: Step S1 of the documents displayed in a list in Step S17
It is determined whether another document different from the document selected in 8 is selected (step S27). If the selection is performed, the process returns to step S19. If the selection is not performed, Determines whether a predetermined operation for ending the document search process has been performed (step S28).

Step S29: Since a predetermined operation for ending the document search process is not detected in step S29, in this step, an operation for displaying other information such as another drawing of the currently selected document. Is performed by the user. If the operation is performed, the process returns to step S20, and if the operation is not performed, the process returns to step S26.

Steps S30 to S32: Since a predetermined operation for ending the document search process is detected in step S29, the design information of the search target read in step S1, the step S9 or step S10. In order to send the generated text information, the search word and the search expression output in step S13, and the search results with priorities, such as the search results, to the user terminal 2 of the intellectual property department, for example. It is determined whether or not the predetermined operation is performed (step S30), and when the predetermined operation is performed, the relevant information is sent to the designated department (step S31).

On the other hand, when the predetermined operation is not performed, the information associated with the current search work is managed in-house so as to be effectively used for the search work from the next time onward.
The data is stored in the past technical research material database 6 (step S32), and the process returns to step S1.

As described above, according to the present embodiment, the user (search worker) does not have to think of an appropriate word (search word, keyword) representing the object by himself, and the drawing represented by the design information about the object is displayed. From this, an appropriate sentence that represents the object is automatically extracted, and by using the extracted sentence, search work such as prior art search can be performed quickly and easily with high accuracy. The efficiency of can be improved.

Further, according to the present embodiment, as shown in FIG. 13, the object is the same as the object in the direction substantially adjusted to the direction of the object shown in the drawing information read from the document of the search result. Since the structure represented by the three-dimensional CAD information is displayed on the screen, the user can easily recognize the corresponding part between the two objects displayed on the display.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an information search system in the present embodiment.

FIG. 2 is a block diagram showing an overall configuration of an information search function in this embodiment.

FIG. 3 is a flowchart showing a document search process executed by the user terminal 1 in this embodiment.

FIG. 4 is a flowchart showing a search control process executed by the user terminal 1 in this embodiment.

FIG. 5 is a flowchart showing a search control process executed by the user terminal 1 in this embodiment.

FIG. 6 is a flowchart showing a search control process executed by the user terminal 1 in this embodiment.

FIG. 7 is a diagram exemplifying a state in which an object to be searched is selected in the three-dimensional CAD drawing displayed on the display based on the design information read from the CAD / CAE database 4.

FIG. 8 is a diagram exemplifying a table in which terms included in attribute information associated with three-dimensional CAD information are extracted for each member.

FIG. 9 is a diagram exemplifying a sentence representing a mode of a drawing represented in three-dimensional CAD information.

FIG. 10 shows a step S1 for the object selected by the user in the drawing represented by the three-dimensional CAD information.
It is a figure which illustrates the search formula produced | generated by 1 and step S12.

FIG. 11 is a diagram illustrating a list display screen of search results of documents.

FIG. 12 is a diagram illustrating a procedure of analysis processing when selecting a part of a document in a predetermined unit in step S24.

FIG. 13 is a diagram illustrating a screen on which an object represented by drawing information selected from a document and a drawing represented by three-dimensional CAD information are displayed together.

FIG. 14 is a diagram exemplifying a state in which an object to be searched is selected in the control block diagram displayed on the display based on the design information read from the CAD / CAE database 4.

FIG. 15 is a diagram exemplifying a table in which terms included in attribute information associated with a control block diagram are extracted for each member.

FIG. 16 is a diagram illustrating an example of a sentence representing an aspect of a control block diagram.

FIG. 17 shows steps S11 and S for an object selected by the user in the control block diagram.
It is a figure which illustrates the search formula produced | generated in 12.

[Explanation of symbols]

1,2: user terminal, 3: communication network, 4: CAD / CAE database, 5: Replacement word database for search, 6: Database of past technical research materials, 7: Industrial property literature database, 8: Technical paper database,

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keiji Araki             3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda             Within the corporation (72) Inventor Shigefumi Hirabayashi             3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda             Within the corporation (72) Inventor Akihiro Kobayashi             3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda             Within the corporation F term (reference) 5B046 DA09 FA02 FA18 HA09 KA05                 5B075 ND06 ND20 PP02 PP03 PP13                       PQ02 PQ12 PQ20 PQ32 QP10                       UU21 UU22

Claims (9)

[Claims] 1. A detection means for detecting a direction of a first object represented in the drawing information based on the first drawing information, and a second means for displaying a second object represented in the three-dimensional drawing information. Display control means for controlling the display mode so that the direction of the second object on the display screen is substantially the same as the direction of the first object detected by the detection means;
A display device comprising: 2. The display control means searches the second object displayed on the display screen for a part similar to or corresponding to the first object, and highlights the part corresponding to the search result. The display device according to claim 1, wherein: 3. The display device according to claim 1, wherein the three-dimensional drawing information is three-dimensional CAD information. 4. The display device according to claim 1, wherein the first drawing information is drawing information included in or associated with the document information. 5. The display device according to claim 1, wherein the display control means displays the first object on the same display screen when displaying the second object. 6. The second image represented in the three-dimensional drawing information
The object is a solid model, and when the display control means displays the first and second objects on the same display screen, the aspect of the first object represented in the first drawing information is a cross section. The display device according to claim 1, wherein, in the case of a shape, the solid model is displayed in a state of being developed into a sectional shape. 7. A drawing display method using a display device, comprising: a detecting step of detecting a direction of a first object represented in the drawing information based on the first drawing information; and a three-dimensional drawing information. When displaying the second object, an adjusting step of adjusting the display mode so that the direction of the second object on the display screen is substantially the same as the direction of the first object detected by the detecting means. And a method of displaying a drawing. 8. A computer program as the display device according to claim 1, which gives instructions to operate a computer. 9. A computer program for issuing an operation instruction of the drawing display method according to claim 7.