Patent Publication Number: US-6985864-B2

Title: Electronic document processing apparatus and method for forming summary text and speech read-out

Description:
This is a divisional of U.S. application Ser. No. 09/763,832, filed Jun. 18, 2001 , which is a 371 of PCT/JP00/04109, filed Jun. 22, 2000, the disclosure of which is incorporated herein by reference. 

   TECHNICAL FIELD 
   This invention relates to an electronic document processing apparatus for processing electronic documents. 
   BACKGROUND ART 
   Up to now, a WWW (World Wide Web) is presented in the Internet as an application service furnishing the hypertext type information in the window form. 
   The WWW is a system executing document processing for document formulation, publication or co-owning for showing what should be the document of a new style. However, from the standpoint of actual document utilization, an advanced documentation surpassing the WWW, such as document classification or summary derived from document contents, is retained to be desirable. For this advanced document processing, mechanical processing of the document contents is indispensable. 
   However, mechanical processing of the document contents is still difficult for the following reason. First, the HTML (Hyper Text Markup Language), as a language stating the hypertext, prescribing the expression in the document, scarcely prescribes the document contents. Second, the network of the hypertext network, formed between the documents, is not necessarily utilizable readily for a reader of the document desirous to understand the document contents. Third, an author of a document writes without taking the convenience in reading for a reader into account, however, it never occurs that the convenience for the reader of the document is compromised with the convenience for the author. 
   That is, the WWW, which is a system showing what should be the new document, is unable to perform advanced document processing because it cannot process the document mechanically. Stated differently, mechanical document processing is necessary in order to execute highly advanced document processing. 
   In this consideration, a system for supporting the mechanical document processing has been developed on th basis of the results of investigations into natural languages. There has been proposed the mechanical document processing exploiting the attribute information or tags as to the inner structure of the document affixed by the authors of the document. 
   Meanwhile, the user exploits an information retrieval system, such as a so-called search engine, to search the desired information from the voluminous information purveyed over the Internet. This information retrieval system is a system for retrieving the information based on the specified keyword to furnish the retrieved information to the user, who then selects the desired information from the so-furnished information. 
   In the information retrieval system, the information can be retrieved in this manner extremely readily. However, the user has to take a glance of the information furnished on retrieval to understand the schematics to check whether or not the information is what the or she desires. This operation means a significant load on the user if the furnished information is voluminous. So, notice is recently directed to a so-called automatic summary formulating system which automatically summarizes the contents of the text information, that is document contents. 
   The automatic summary formulating system is such a system which formulates a summary by decreasing the length or complexity of the text information while retaining the purport of the original information, that is the document. The user may take a glance through the summary prepared by this automatic summary formulating system to understand the schematics of the document. 
   Usually, the automatic summary formulating system adds the degree of importance derived from some information to the sentences or words in the text as units by way of sequencing. The automatic summary formulating system agglomerates the sentences or words of an upper order in the sequence to formulate a summary. 
   Recently, with the coming into extensive use of computers and in networking, there is raised a demand towards higher functions of document processing, in particular towards the function of speech-synthesizing and reading the document out. 
   Inherently, speech synthesis generates the speech mechanically based on the results of speech analysis and on the simulation of the speech generating mechanism of the human being, and assembles elements or phonemes of the individual language under digital control. 
   However, with speech synthesis, a given document cannot be read out taking the interruptions in the document into account, such that natural reading cannot be achieved. Moreover, in speech synthesis, the user has to select a speech synthesis engine depending on the particular language used. Also, in speech synthesis, the precision in correct reading of words liable to misreading, such as specialized terms or Chinese words difficult to pronounce in Japanese, depends on the particular dictionary used. In addition, if a summary text is prepared, it can be visually grasped that the portion of the text is critical, however, it is difficult to attract the user&#39;s attention if speech synthesis is used. 
   DISCLOSURE OF THE INVENTION 
   In view of the above-depicted status o the art, it is an object of the present invention to provide an electronic document processing method and apparatus whereby a given document can be read out by speech synthesis to high precision without extraneous feeling and under stressing critical text portions, and a recording medium having an electronic document processing program recorded thereon. 
   For accomplishing the above object, the present invention provides an electronic document processing apparatus for processing an electronic document, including document inputting means fed with an electronic document, and speech read-out data generating means for generating speech read-out data for reading out by a speech synthesizer based on the electronic document. 
   In this electronic document processing apparatus, according to the present invention, speech read-out data is generated based on the electronic document. 
   For accomplishing the above object, the present invention provides an electronic document processing method for processing an electronic document, including a document inputting step of being fed with an electronic document, and a speech read-out data generating step of generating speech read-out data for reading out by a speech synthesizer based on the electronic document. 
   In this electronic document processing method, according to the present invention, speech read-out data is generated based on the electronic document. 
   For accomplishing the above object, the present invention provides a recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, in which the program includes a document inputting step of being fed with an electronic document, and a speech read-out data generating step of generating speech read-out data for reading out by a speech synthesizer based on the electronic document. 
   In this recording medium, having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, the program generates speech read-out data based on the electronic document. 
   For accomplishing the above object, the present invention provides an electronic document processing apparatus for processing an electronic document, including document inputting means for being fed with the electronic document of a hierarchical structure having a plurality of elements and to which is added the tag information indicating the inner structure of the electronic document, and document read-out means for speech-synthesizing and reading out the electronic document based on the tag information. 
   In this electronic document processing apparatus, according to the present invention, the electronic document, to which is added the tag information indicating its inner structure, is input, and the electronic document is directly read out based on the tag information added to the electronic document. 
   For accomplishing the above object, the present invention provides an electronic document processing method for processing an electronic document, including a document inputting step of being fed with the electronic document of a hierarchical structure having a plurality of elements and to which is added the tag information indicating the inner structure of the electronic document, and a document read-out step of speech-synthesizing and reading out the electronic document based on the tag information. 
   In this electronic document processing method, according to the present invention, the electronic document, having a plurality of elements, and to which is added the tag information indicating the inner structure of the electronic document, is input, and the electronic document is directly read out based on the tag information added to the electronic document. 
   For accomplishing the above object, the present invention provides a recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, in which the program includes a document inputting step of being fed with the electronic document of a hierarchical structure having a plurality of elements and having added thereto the tag information indicating its inner structure, and a document read-out step of speech-synthesizing and reading out the electronic document based on the tag information. 
   In this recording medium, having a computer-controllable electronic document processing program, recorded thereon, there is provided an electronic document processing program in which the electronic document of a hierarchical structure having a plurality of elements and having added thereto the tag information indicating its inner structure is input and in which the electronic document is directly read out based on the tag information added to the electronic document. 
   For accomplishing the above object, the present invention provides an electronic document processing apparatus for processing an electronic document, including summary text forming means for forming a summary text of the electronic document, and speech read-out data generating means for generating speech read-out data for reading the electronic document out by a speech synthesizer, in which the speech read-out data generating means generates the speech read-out data as the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text. 
   In this electronic document processing apparatus, according to the present invention, the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text is added in generating the speech read-out data. 
   For accomplishing the above object, the present invention provides a recording program having recorded thereon a computer-controllable program for processing an electronic document, in which the program includes a summary text forming step of forming a summary text of the electronic document, and a speech read-out data generating step of generating speech read-out data for reading the electronic document out by a speech synthesizer. The speech read-out data generating step generates the speech read-out data as it adds the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text. 
   In this recording program having recorded thereon a computer-controllable program for processing an electronic document, there is provided an electronic document processing program in which the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text is added in generating speech read-out data. 
   For accomplishing the above object, the present invention provides an electronic document processing apparatus for processing an electronic document, including summary text forming means for preparing a summary text of the electronic document, and document read-out means for reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text. 
   In this electronic document processing apparatus, according to the present invention, the portion of the electronic document included in the summary text is read out with emphasis as compared to the portion thereof not included in the summary text. 
   For accomplishing the above object, the present invention provides an electronic document processing method for processing an electronic document, including a summary text forming step for forming a summary text of the electronic document, and a document read out step of reading out a portion of the electronic document included in the summary text with emphasis as compared to the portion thereof not included in the summary text. 
   In the electronic document processing method, according to the present invention, the portion of the electronic document included in the summary text is read out with emphasis as compared to the portion thereof not included in the summary text. 
   For accomplishing the above object, the present invention provides a recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, the program including a summary text forming step for forming a summary text of the electronic document, and a document read out step of reading out a portion of the electronic document included in the summary text with emphasis as compared to the portion thereof not included in the summary text. 
   In this recording medium, having recorded thereon the electronic document processing program, according to the present invention, there is provided an electronic document processing program in which the portion of the electronic document included in the summary text is read out with emphasis as compared to the portion thereof not included in the summary text. 
   For accomplishing the above object, the present invention provides an electronic document processing apparatus for processing an electronic document including detection means for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and speech read-out data generating means for reading the electronic document out by the speech synthesizer by adding to the electronic document speech read-out data the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase based on detected results obtained by the detection means. 
   In this electronic document processing apparatus, according to the present invention, the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase is added in generating speech read-out data. 
   For accomplishing the above object, the present invention provides an electronic document processing method for processing an electronic document including a detection step of detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and a speech read-out data generating step of reading the electronic document out by the speech synthesizer by adding to the electronic document speech read-out data the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase based on detected results obtained by the detection means. 
   In this electronic document processing method, according to the present invention, the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase is added to generate speech read-out data. 
   For accomplishing the above object, the present invention provides a recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, in which the program includes a detection step of detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and a step of generating speech read-out data for reading out in a speech synthesizer by adding to the electronic document the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase. 
   In the recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, according to the present invention, there is provided an electronic document processing program in which the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase is added to generate speech read-out data. 
   For accomplishing the above object, the present invention provides an electronic document processing apparatus for processing an electronic document including detection means for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and document read out means for speech-synthesizing and reading out the electronic document by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase, based on the result of detection by the detection means. 
   In the electronic document processing apparatus, according to the present invention, the electronic document is read out by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase. 
   For accomplishing the above object, the present invention provides an electronic document processing method for processing an electronic document including a detection step for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and a document read-out step for speech-synthesizing and reading out the electronic document by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase, based on the result of detection by the detection step. 
   In the electronic document processing method, the electronic document is read out as respective different pause periods are provided at beginning positions of at least two of the paragraph, sentence and phrase. 
   For accomplishing the above object, the present invention provides a recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, in which the program includes a detection step for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and a document read-out step for speech-synthesizing and reading out the electronic document, as respective different pause periods are provided at beginning positions of at least two of the paragraph, sentence and phrase, based on the result of detection by the detection step. 
   In this recording medium, having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, according to the present invention, there is provided an electronic document processing program in which the electronic document is read out as respective different pause periods are provided at beginning positions of at least two of the paragraph, sentence and phrase. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a block diagram for illustrating the configuration of a document processing apparatus embodying the present invention. 
       FIG. 2  illustrates an inner structure of a document. 
       FIG. 3  illustrates the display contents of a display unit and shows a window in which the inner structure of a document is indicated by tags. 
       FIG. 4  is a flowchart for illustrating the sequence of processing operations in reading a document out. 
       FIG. 5  shows a typical Japanese document received or formulated and specifically shows a window demonstrating a document. 
       FIG. 6  shows a typical English document received or formulated and specifically shows a window demonstrating a document. 
       FIG. 7A  shows a tag file which is a tagged Japanese document shown in FIG.  5  and specifically shows its heading portion. 
       FIG. 7B  shows a tag file which is the tagged Japanese document shown in FIG.  5  and specifically shows its last paragraph. 
       FIG. 8  shows a tag file which is a tagged Japanese document shown in  FIG. 5   
       FIG. 9A  shows a speech reading file generated from the tag file shown in FIG.  7  and corresponds to extract of the heading portion shown in FIG.  7 A. 
       FIG. 9B  shows a speech reading file generated from the tag file shown in FIG.  7  and corresponds to extract of the last paragraph shown in FIG.  7 B. 
       FIG. 10  shows a speech reading file generated from the tag file shown in FIG.  8 . 
       FIG. 11  is a flowchart for illustrating the sequence of operations in generating the speech reading file. 
       FIG. 12  shows a user interface window. 
       FIG. 13  shows a window demonstrating a document. 
       FIG. 14  shows a window demonstrating a document and particularly showing a summary text demonstrating display area enlarged as compared to a display area shown in FIG.  13 . 
       FIG. 15  is a flowchart for illustrating a sequence of processing operations in preparing a summary text. 
       FIG. 16  is a flowchart for illustrating a sequence of processing operations in executing active diffusion. 
       FIG. 17  illustrates an element linking structure for illustrating the processing for active diffusion. 
       FIG. 18  is a flowchart for illustrating a sequence of processing operations in performing link processing for active diffusion. 
       FIG. 19  shows a document and a window demonstrating its summary test. 
       FIG. 20  is a flowchart for illustrating a sequence of processing operations in changing a demonstration area for a summary text to prepare a summary text newly. 
       FIG. 21  shows a window representing a document and a window demonstrating its summary text and specifically shows a summary text demonstrated on the window shown in FIG.  14 . 
       FIG. 22  is a flowchart for illustrating a sequence of processing operations in preparing a summary text to read out a document. 
       FIG. 23  is a flowchart for illustrating a sequence of processing operations in preparing a summary text to then read out a document. 
   

   BEST MODE FOR CARRYING OUT THE INVENTION 
   Referring to the drawings, certain preferred embodiments of the present invention are explained in detail. 
   A document processing apparatus, embodying the present invention, has the function of processing a given electronic document or a summary text prepared therefrom with a speech synthesis engine for speech synthesis for reading out. In reading out the electronic document or summary text, the elements comprehended in the summary text are read out with an increased volume, whilst the paragraphs making up the electronic document or the summary text, or the start positions of the sentences and phrases, are read out with a pre-set pause period. In the following description, the electronic document is simply termed a document. 
   Referring to  FIG. 1 , the document processing apparatus includes a main body portion  10 , having a controller  11  and an interface  12 , an input unit  20  for furnishing the information input by a user to the main body portion  10 , a receiving unit  21  for receiving an external signal to supply the received signal to the main body portion  10 , a communication unit  22  for performing communication between a server  24  and the main body portion  10 , a speech output unit  30  for outputting the information input by the user to the main body portion  10  and a display unit  31  for demonstrating the information output from the main body portion  10 . The document processing apparatus also includes a recording and/or reproducing unit  32  for recording and/or reproducing the information to or from a recording medium  33 , and a hard disc drive HDD  34 . 
   The main body portion  10  includes a controller  11  and an interface  12  and forms a major portion of this document processing apparatus. 
   The controller  11  includes a CPU (central processing unit)  13  for executing the processing in this document processing apparatus, a RAM (random access memory)  14 , as a volatile memory, and a ROM (read-only memory)  15  as a non-volatile memory. 
   The CPU  13  manages control to execute a program in accordance with a program recorded on e.g., the ROM  15  or on the hard disc. In the RAM  14  are transiently recorded a program or data necessary for executing variable processing operations. 
   The interface  12  is connected to the input unit  20 , receiving unit  21 , communication unit  22 , display unit  31 , recording and/or reproducing unit  32  and to the hard disc drive  34 . The interface  12  operates under control of the controller  11  to adjust the data input/output timing in inputting data furnished from the input unit  20 , receiving unit  21  and the communication unit  22 , outputting data to the display unit  31  and inputting/outputting data to or from the recording and/or reproducing unit  32  to convert the data form. 
   The input unit  20  is a portion receiving a user input to this document processing apparatus. This input unit  20  is formed by e.g., a keyboard or a mouse. The user employing this input unit  20  is able to input a key word by a keyboard or select and elements of a document demonstrated on the display unit  31  by a mouse. Meanwhile, the elements denote elements making up the document and comprehends e.g., a document, a sentence and a word. 
   The receiving unit  21  receives data transmitted from outside via e.g., a communication network. The receiving unit  21  receives plural documents, as electronic documents, and an electronic document processing program for processing these documents. The data received by the receiving unit  21  is supplied to the main body portion  10 . 
   The communication unit  22  is made up e.g., of a modem or a terminal adapter, and is connected over a telephone network to the Internet  23 . To the Internet  23  is connected the server  24  which holds data such as documents. The communication unit  22  is able to access the server  24  over the Internet  23  to receive data from the server  24 . The data received by the communication unit  22  is sent to the main body portion  10 . 
   The speech output unit  30  is made up e.g., of a loudspeaker. The speech output unit  30  is fed over the Interface  12  with electrical speech signals obtained on speech synthesis by e.g., a speech synthesis engine or other variable speech signals. The speech output unit  30  outputs the speech converted from the input signal. 
   The display unit  31  is fed over the interface  12  with text or picture information to display the input information. Specifically, the display unit  31  is made up e.g., of a cathode ray tube (CRT) or a liquid crystal display (LCD) and demonstrates one or more windows on which to display the text or figures. 
   The recording and/or reproducing unit  32  records and/or reproduces data to or from a removable recording medium  33 , such as a floppy disc, an optical disc or a magneto-optical disc. The recording medium  33  has recorded therein an electronic processing program for processing documents and documents to be processed. 
   The hard disc drive  34  records and/or reproduces data to or from a hard disc as a large-capacity magnetic recording medium. 
   The document processing apparatus, described above, receives a desired document to demonstrate the received document on the display unit  31 , substantially as follows: 
   In the document processing apparatus, if the user first acts on the input unit  20  to boot a program configured for having communication over the Internet  23  to input the URL (uniform resource locator) of the server  24 , the controller  11  controls the communication unit  22  to access the server  24 . 
   The server  24  accordingly outputs data of a picture for retrieval to the communication unit  22  of the document processing apparatus overt the Internet  23 . In the document processing apparatus, the CPU  13  outputs the data over the interface  12  on the display unit  31  for display thereon. 
   In the document processing apparatus, if the user inputs e.g., a keyword on the retrieval picture, using the input unit  20  to command retrieval, a command for retrieval is transmitted from the communication unit  22  over the Internet  23  to the server  24  as a search engine. 
   On receipt of the retrieval command, the server  24  executes the this retrieval command to transmit the result of retrieval to the communication unit  22 . In the document processing apparatus, the controller  11  controls the communication unit  22  to receive the result of retrieval transmitted from the server  24  to demonstrate its portion on the display unit  31 . 
   If specifically the user has input a keyword TCP using the input unit  20 , the variable information including the keyword TCP is transmitted from the server  24  so that the following document, for example, is demonstrated on the display unit  31 ; “TCP/IP (Transmission Control Protocol/Internet Protocol)                     TCP/IP   ARPENET       ARPENET     Advanced Research Project Agency Network             DOD (Department of Defence)     (DARPA: Defence Advanced Research Project Agency)                 1969             50 kbps             ARPENET  1945       ENIAC         1964     IC                                          ”(which reads: “It is not too much to say that the history of TCP/IP (Transmission Control Protocol/Internet protocol) is the history of the computer network of North America or even that of the world. The history of the TCP/IP cannot be discussed if APPANET is discounted. The APPANET, an acronym of Advanced Research Project Agency Network, is a packet exchanging network for experimentation and research constructed under the sponsorship of the DARPA (Defence Advanced Research Project Agency) of the DOD (Department of Defence) of the Department of Defence. The APPANET was initiated from a network of an extremely small scale which has interconnected host computers of four universities and research laboratories on the west coast of North America in 1969. 
   Historically, the ENIAC, as the first computer in the world, was developed in 1945 in Pennsylvania University. A general-purpose computer series, loaded for the first time with an IC as a theoretical device, and which commenced the history of the third generation computer, was developed in 1964, marking the beginning of a usable computer. In light of this historical background, it may even be said that such project, which predicted the prosperity of future computer communication, is truly American”.) 
   This document has its inner structure described by the tagged attribute information as later explained. The document processing in the document processing apparatus is by referencing tags added to the document. That is, in the present embodiment, not only the syntactic tags, representing a document structure, but also the semantic and pragmatic tags, which enable mechanical understanding of document contents among plural languages, are added to the document. 
   Among syntactic tagging, there is a tagging stating a tree-like inner document structure. That is, in the present embodiment, the inner structure by tagging, elements, such as document, sentences or vocabulary elements, normal links, referencing links or referenced links, are previously added as tags to the document. In  FIG. 2 , white circles ∘ denote document elements, such as vocabulary, segments or sentences, with the lowermost circles ∘ denoting vocabulary elements corresponding to the smallest level words in the document. The solid lines denote normal links indicating connection between document elements, such as words, phrases, clauses or sentences, whilst broken lines denote reference links indicating the modifying/modified relation by the referencing/referenced relation. The inner document structure is comprised of a document, subdivision, paragraph, sub-sentential segment, . . . , vocabulary elements. Of these, the subdivision and the paragraphs are optional. 
   The semantic and pragmatic tagging includes tagging pertinent to the syntactic structure representing the modifying/modified relation, such as an object indicated by a pronoun, and tagging stating the semantic information, such as meaning of equivocal words. Th tagging in the present embodiment is of the form of XML (eXtensible Markup Language) similar to the HTML (Hyper Text Markup Language). 
   Although a typical inner structure of a tagged document is shown below, it is noted that the document tagging is not limited to this method. Moreover, although a typical document in English and Japanese is shown below, the description of the inner structure by tagging is applicable to other languages as well. 
   For example, in a sentence “time flies like an arrow”, tagging may be by &lt;sentence&gt; &lt;noun phrase meaning=“Time0”&gt; time&lt;/noun phrase&gt; &lt;verb phrase&gt; &lt;verb meaning=“fly1”&gt; flies &lt;/verb&gt; &lt;adjective verb phrase&gt; &lt;adjective verb meaning=“like0”&gt; like &lt;/adjective verb&gt; &lt;noun phrase&gt; an &lt;noun meaning=“arrow0”&gt; arrow &lt;/noun&gt; &lt;/noun phrase&gt; &lt;/adjective phrase&gt; &lt;/verb phrase&lt;.&lt;/sentence&gt;. 
   It is noted that &lt;sentence&gt;, &lt;noun&gt;, &lt;noun phrase&gt;, &lt;verb&gt;, &lt;verb phrase&gt;, &lt;adjective verb&gt; and &lt;adjective verb phrase&gt; denote a syntactic structure of a sentence, such as prepositional phrase, postpositional phrase/adjective phrase, or adjective phrase/adjective verb phrase, including the sentence, noun, noun phrase, verb, verb phrase and adjective, respectively. The tag is placed directly before the leading end of the element and directly after the end of the element. The tag placed directly below the element denotes the trailing end of the element by a symbol “/”. The element means syntactic structural element, that is a phrase, a clause or a sentence. Meanwhile, the meaning (word sense)=“time0” denotes the zeroth meaning of plural meanings, that is plural word senses, proper to the word “time”. Specifically, the “time”, which may be a noun or a verb, it is indicated that, here, it is noun. In addition, word “orange” has the meaning of at least the name or color of a plant or a fruit, which can be differentiated from one another by the meaning. 
   In the document processing apparatus, employing this document, the syntactic structure may be demonstrated on a window  101  of the display unit  31 . In the window  101 , the vocabulary elements are displayed in its right half  103 , whilst the inner structure of the sentence is demonstrated in its left half  102 . In this window  101 , the syntactic structure may be demonstrated not only in the document expressed in Japanese, but also in documents expressed in optional other languages, inclusive of English. 
   Specifically, there is displayed, in the right half  103  of the window  101 , a part of the following tagged document “A  B     C            (which reads: “In a city C, where a meeting B by Mr. A has finished, certain popular newspapers and high-brow newspapers clarified a guideline of voluntarily regulating photographic reports in their articles”) is displayed. The following is typical tagging for this document:
     &lt;document&gt; &lt;sentence&gt; &lt;adjective phrase relation=“place”&gt; &lt;noun phrase&gt; &lt;adjective verb phrase relation=“C ”&gt;&lt;adjective verb phrase relation=“subject”&gt; &lt;noun phrase identifier=“B ”&gt; &lt;adjective verb phrase relation=“possession”&gt; &lt;personal name identifier=“A ”&gt; A &lt;/personal name&gt; &lt;/adjective verb phrase&gt; &lt;name of an organization identifier=“B ”&gt; B &lt;/name of an organization&gt; &lt;/noun phrase&gt; &lt;/adjective verb phrase&gt; &lt;/adjective verb phrase&gt; &lt;place name identifier=“C ”&gt;C &lt;/place name&gt; &lt;/noun phrase&gt; &lt;/adjective verb phrase&gt; &lt;adjective verb phrase relation=“subject”&gt; &lt;noun phrase identifier=“newspaper” syntactic word=“parallel”&gt; &lt;noun phrase&gt; &lt;adjective verb phrase&gt; &lt;/adjective verb phrase  &lt;/noun phrase&gt; &lt;noun&gt; &lt;/noun&gt; &lt;/noun phrase&gt; &lt;/adjective verb phrase&gt; &lt;adjective verb phrase relation=“object”&gt; &lt;/adjective verb phrase relation=“contents” subject=“newspaper”&gt; &lt;adjective verb phrase relation=“object”&gt; &lt;noun phrase&gt; &lt;adjective verb phrase&gt; &lt;noun co-reference=“B ”&gt; &lt;/noun&gt;  &lt;/adjective verb phrase&gt; &lt;/noun phrase&gt;  &lt;/adjective verb phrase&gt;  &lt;/adjective verb phrase&gt;  &lt;/adjective verb phrase&gt; &lt;adjective verb phrase relation=“position”&gt;  &lt;/adjective verb phrase&gt;  &lt;/sentence&gt; &lt;/document&gt;   

   In the above document, “    reading: certain popular newspapers and certain high-brow newspapers” are represented as being parallel by a tag of a syntactic word=“parallel”. The parallel may be defined as having a modifying/modified relation. Failing any particular designation, &lt;noun phrase relation=“x”&gt; &lt;noun&gt;A &lt;/noun&gt; &lt;noun&gt;B &lt;noun&gt; &lt;/noun phrase&gt; indicates that A is dependent on B. 
   The relation=“x” denotes a relational attribute, which describe a reciprocal relation as to the syntactic word, meaning and modification. The grammatical functions, such as subject, object or indirect object, subjective roles, such as an actor, an actee or benefiting party and the modifying relation, such as reason or result, are stated by relational attributes. The relational attributes are represented in the form of relation=***. In the present embodiment the relational attributes are stated as to simpler grammatical functions, such as subject, object or indirect object. 
   In this document, attributes of the proper nouns, such as “A  “B ” and “C ” which read “Mr. A”, “meeting B” and “city C”, respectively, are stated by tags of e.g., place names, personal names or names of organizations. These tagged words, such as place names, personal names or names of organizations, are proper nouns. 
   The document processing apparatus is able to receive such tagged document. If a speech read-out program of the electronic document processing program, recorded on the ROM  15  or on the hard disc, is booted by the CPU  13 , the document processing apparatus reads the document out through a series of steps shown in FIG.  4 . Here, respective simplified steps are first explained, and respective steps are explained in detail, taking a typical document as examples. 
   First, the document processing apparatus receives a tagged document at step S 1  in FIG.  4 . Meanwhile, it is assumed that tags necessary for speech synthesis have been added to this document. The document processing apparatus is also able to receive a tagged document to add tags necessary to perform speech synthesis to the document to prepare a document. The document processing apparatus is also able to receive a non-tagged document to add tags inclusive of those necessary to effect speech synthesis to the document to prepare a tagged file. In the following, the tagged document, thus received or prepared, is termed a tagged file. 
   The document processing apparatus then generates, at step S 2 , a speech read-out file (read-out speech data) based on the tagged file, under control by the CPU  13 . The read-out file is generated by deriving the attribute information for read-out from the tag in the tagged file, and by embedding the attribute information, as will be explained subsequently. 
   The document processing apparatus then at step S 3  performs processing suited to the speech synthesis engine, using the speech read-out file, under control by the CPU  13 . The speech synthesis engine may be realized by hardware, or constructed by software. If the speech synthesis engine is to be realized by software, the corresponding application program is stored from the outset in the ROM  15  or on the hard disc of the document processing apparatus. 
   The document processing apparatus then performs the processing in keeping with operations performed by the user through a user interface which will be explained subsequently. 
   By such processing, the document processing apparatus is able to read out the given document on speech synthesis. The respective steps will now be explained in detail. 
   First, the reception or the formulation of the tagged document at step S 1  is explained. The processing apparatus accesses the server  24  shown in  FIG. 1 , as discussed above, and receives a document as a result obtained on retrieval based on e.g., a keyword. The document processing apparatus receives the tagged document and newly adds tags required for speech synthesis to formulate a document. The document processing apparatus is also able to receive a non-tagged document and adds tags to the document including tags necessary for speech synthesis to prepare a tagged file. 
   It is here assumed that a tagged file obtained on tagging a document in Japanese or in English shown in  FIGS. 5 and 6  has been received or formulated. That is, the original document of the tagged file shown in  FIG. 5  is the following document in Japanese: 
   “       !?                                                                                                                                                                                                     
   The above Japanese text reads in English context as follows: “[Aging Wonderfully]/8 is cancer transposition suppressible?] 
   In the last ten or more years, cancer ranks first among the causes of mortality in this country. The rate of mortality tends to be increased as the age progresses. If the health of the aged is to be made much of, the problem of cancer cannot be overlooked. 
   What characterizes the cancer is cell multiplication and transposition. Among cells of the human being, there are cancer genes simulated to an accelerator in a vehicle and which are responsible for cancer multiplication and cancer suppressing genes simulated to a brake in the vehicle. 
   If these two are balanced to each other, no problem arises. If the normal adjustment mechanism is lost, such that changes that cannot be braked occur in the cells, cancer multiplication begins. With the aged people, this change is accumulated with time, and the proportion of the cells disposed to transition to cancer is increased to cause cancer. 
   Meanwhile, if it were not for another feature, that is transposition, the cancer is not so dreadful, because mere dissection leads to complete curing. Here lies the importance of suppressing the transposition. 
   This transposition is not produced simply due to multiplication of cancer cells. The cancer cells dissolve the protein between the cells to find their way to intrude into the blood vessel or lymphatic vessel. It has recently discovered that the cancer cells perform complex movements of searching for new abodes as they are circulated to intrude into the so-found-out abodes”. 
   On receipt of this Japanese text, the document processing apparatus demonstrates the document in the window  110  in the display unit  31 . The window  110  is divided into a display area  120 , in which are demonstrated the document name display unit  111 , a key word input unit  112 , into which the keyword is input, a summary preparation execution button  113 , as an executing button for creating a summary text of the document, as later explained, and a read-out executing button  114  for executing reading out, and a document display area  130 . On the right end of the document display area  130  are provided a scroll bar  131  and buttons  132 ,  133  for vertically moving the scroll bar  131 . If the user directly moves the scroll bar  131  in the up-and-down direction, using the mouse of e.g., the input unit  20 , or thrusts the buttons  132 ,  133  to move the scroll bar  131  vertically, the display contents on the document display area  130  can be scrolled vertically. 
   On the other hand, the original document of the tagged file shown in  FIG. 6  is the following document in English: 
   “During its centennial year, The Wall Street Journal will report events of the past century that stand out as milestones of American business history. THREE COMPUTERS THAT CHANGED the face of the personal computing were launched in 1977. That year the Apple II, Commodore Pet and Yandy TRS came to market. The computers were crude by to-day&#39;s standards. Apple II owners, for example, had to use their television sets as screens and stored data on audiocassettes.” 
   On receipt of this English document, the document processing apparatus displays the document in the window  140  demonstrated on the display unit  31 . Similarly to the window  110 , the window  140  is divided into a display area  150  for displaying a document name display portion  141 , for demonstrating the document name, a key word input portion  142  for inputting the key word, a summary text creating button  143 , as an execution button for preparing the summary text of the document, and a read-out execution button  144 , as an execution button for reading out, and a document display area  160 . On the right end of the document display area  160  are provided a scroll bar  161  and buttons  162 ,  163  for vertically moving the scroll bar  161 . If the user directly moves the scroll bar  161  in the up-and-down direction, using the mouse of e.g., the input unit  20 , or thrusts the buttons  162 ,  163  to move the scroll bar  161  vertically, the display contents on the document display area  160  can be scrolled vertically. 
   The documents in Japanese and in English, shown in  FIGS. 5 and 6 , respectively, are formed as tagged files shown in  FIGS. 7 and 8 , respectively. 
     FIG. 7A  shows the heading portion “        ?” which reads: “[Aging Wonderfully]/8 is cancer transposition suppressible?]” extracted from the Japanese document. On the other hand, the tagged file shown in  FIG. 7B  shows the last paragraph of the document “                                                  which reads: “This transposition is not produced simply due to multiplication of cancer cells. The cancer cells dissolve the protein between the cells to find their way to intrude into the blood vessel or lymphatic vessel. It has recently discovered that the cancer cells perform complex movements of searching for new abodes as they are circulated to intrude into the so-found-out abodes”, as extracted from the same document, with the remaining paragraphs being omitted. It is noted that the real tagged file is constructed as one file from the heading portion to the last paragraph. 
   In the heading portion, shown in  FIG. 7A , the &lt;heading&gt; indicates that this portion is the heading. To the last paragraph, shown in  FIG. 7B , a tag indicating that the relational attribute is “condition” or “means” is added. The last paragraph shown in  FIG. 7B  shows an example of a tag necessary to effect the above-mentioned speech synthesis. 
   Among the tags necessary for speech synthesis, there is such tag which is added when the information indicating the pronunciation (Japanese hiragana letters to indicate the pronunciation) is added to the original document, as in the casse of “  (protein, uttered as “tanpaku”) (  (uttered as “tanpaku”))”. In this case, the reading attribute information, that is pronunciation=“null” is added to prevent duplicated reading of “    (uttered as “tanpaku tanpaku”)”, that is, a tag inhibiting the reading out of the “(  (uttered as “tanpaku”))” is added. For this tag, there is also shown the information that it has a special function. 
   Among the tags necessary for speech synthesis, there are such a tag added to a specialized term, such as “  (lymphatic vessel, uttered as “rinpa-kan”)”, or to a word difficult to pronounce, and which is liable to be mis-pronounced, such as “  (abode, uttered as “sumika”)”. That is, in the present case, the reading attribute information showing the pronunciation (Japanese hiragana letters to indicate the pronunciation), that is the pronunciation=  (uttered as “rinpa-kan”)” or the pronunciation=  (uttered as “sumika”)”, in order to prevent the mis-reading of “  (uttered as “rinpa-kuda”)” or   (uttered as “sumi-ie”)”, is used. 
   On the other hand, there is added the tag indicating that the sentence is a complement sentence or that plural sentences are formed in succession to form a sole sentence. As the tag necessary to effect speech synthesis in this tagged file, the reading attribute information of the pronunciation=“two” is stated for the roman figure of II. This reading attribute information is stated to prevent the misreading of   (uttered as “second”)” when it is desirable that II be read   (uttered as “two”)”. 
   If a citation is included in a document, there is added a tag indicating that the sentence is a citation, although such tag is not shown. Moreover, if an interrogative sentence is included in a document, a tag, not shown, indicating that the sentence is an interrogative sentence, is added to the tagged file. 
   The document processing apparatus receives or prepares the document, having added thereto a tag necessary for speech synthesis, at step S 1  in FIG.  4 . 
   The generation of the speech read-out file at step S 2  is explained. The document processing apparatus derives the attribute information for reading out, from the tags of the tagged file, and embeds the attribute information, to prepare the speech read-out file. 
   Specifically, the document processing apparatus finds out tags indicating the beginning locations of the paragraphs, sentences and phrases of the document, and embeds the attribute information for reading out in keeping with these tags. If the summary text of the document has been prepared, as later explained, it is also possible for the document processing apparatus to find out the beginning location of the summary text from the document to embed the attribute information indicating enhancing the sound volume in reading out the document to emphasize that the portion being read is the summary text. 
   From the tagged file, shown in  FIG. 7  or  8 , the document processing apparatus generates a speech read-out file. Meanwhile, the speech read-out file, shown in  FIG. 9A , corresponds to the extract of the heading shown in  FIG. 7A , while the speech read-out file shown in  FIG. 9B  corresponds to the extract of the last paragraph shown in FIG.  7 B. Of course, the actual speech read-out file is constructed as a sole file from the header portion to the last paragraph. 
   In the speech read-out file shown in  FIG. 9A , there is embedded the attribute information of Com:=Lang=***, in keeping with the beginning portion of the document. This attribute information denotes the language with which a document is formed. Here, the attribute information is Com:=Lang=JPN, indicating that the language of the document is Japanese. In the document processing apparatus, this attribute information may be referenced to select the proper speech synthesis engine conforming to the language from one document to another. 
   Moreover, in the speech read-out file shown in  FIGS. 9A and 9B , there is embedded the attribute information of Com:=begin_p, Com:=begin_s, and Com:=begin_ph. These attribute information denotes the beginning portions of the paragraph, sentence and the phrase of the document, respectively. Based on the tags in the above-mentioned tagged file, the document processing apparatus detects at least two beginning positions of the paragraphs, sentences and the phrases. If, in the speech read-out file, tags indicating the syntactic structure of the same level appear in succession, as in the case of the &lt;adjective verb phrase&gt; and &lt;noun phrase&gt;, in the above-mentioned tagged file, respective corresponding numbers of the Com:=begin_ph are not embedded, but are collected and a sole Com:=begin_ph is embedded. 
   Also, in the speech read-out file, there is embedded the attribute information of Pau=00, Pau=100 and Pau=50 in keeping with Com:=begin_p, Com:=begin_s, and Com:=begin_ph, respectively. These attribute information indicate that pause periods of 500 msec, 100 msec and 50 msec are to be provided in reading out the document. That is, the document processing apparatus reads the document out by the speech synthesis engine by providing pause periods of 500 msec, 100 msec and 50 msec at the beginning portions of the paragraphs, sentences and phrases of the document, respectively. Meanwhile, these attribute information are embedded in association with the Com:=begin_p, Com:=begin_s, and Com:=begin_ph. So, the portion of the tagged file where the tags indicating the syntactic structure of the same level appear in succession, as in the case of the &lt;adjective verb phrase&gt; and &lt;noun phrase&gt;, is handled as being a sole phrase such that a sole Pau=50 is embedded without a corresponding number of the Pau=50s being embedded. The portions of the document where tags indicating the syntactic structure of different levels appear in succession, as in the case of the &lt;paragraph&gt;, &lt;sentence&gt; and &lt;noun phrase&gt; in the tagged file, respective corresponding Pau=***s are embedded. So, the document processing apparatus reads out the document portion with a pause period of 650 msec corresponding to the sum of the respective pause periods for the paragraph, sentence and the phrase of the document. Thus, with the document processing apparatus, it is possible to provide pause periods corresponding to the paragraph, sentence and the phrase so that the length will be shorter in the sequence of the paragraph, sentence and the phrase to realize the reading out free of an extraneous feeling by taking the interruptions in the paragraph, sentence and the phrase into account. Meanwhile, the pause period can be suitably changed, it being unnecessary for the pause periods at the beginning portions of the paragraph, sentence and the phrase of the document to be 500 msec, 100 msec and 50 msec, respectively. 
   In addition, in the speech read-out file shown in  FIG. 9B , “  (uttered as “tan-paku”))” is removed in association with the reading attribute information of the pronunciation=“null” stated in the tagged file, whilst the “  (lymphatic vessel, uttered as “rinpa-kan”)” and   (abode, uttered as “sumika”)” are replaced by “  (uttered as “rinpa-kan”)” and   (uttered as “sumika”)”, respectively, in keeping with the reading attribute information of pronunciation=“  (uttered as “rinpa-kan”)” and the reading attribute information of pronunciation=“  (uttered “as sumika”)”, respectively. The document processing apparatus, embedding this reading attribute information, is not liable to make a reading error due to defects in the dictionary referenced by the speech synthesis engine. 
   In the speech read-out file, the attribute information for specifying only a citation to use another speech synthesis engine based on the tag indicating that the portion of the document is the citation comprehended in the document. 
   Moreover, the attribute information for intoning the terminating portion of the sentence based on the tag indicating that the sentence is an interrogative sentence may be embedded in the speech read-out file. 
   The attribute information for converting the bookish style by so-called “  (‘is’)” into more colloquial style by “  (again ‘is’ in English context)” as necessary may be embedded in the speech read-out file. In this case, it is also possible to convert the bookish style sentence into colloquial style sentence to generate the speech read-out file instead of embedding the attribute information in the speech read-out file. 
   On the other hand, there is embedded the attribute information Com=Lang=ENG at the beginning portion of the document in the speech read-out file shown in  FIG. 10 , indicating that the language with which the document is stated is English. 
   In the speech read-out file is embedded the attribute information Com=Vol=*** denoting the sound volume in reading the document out. For example, Com=Vol=0 indicates reading out with the default sound volume of the document processing apparatus. Com=Vol=80 denotes that the document is to be read out with the sound volume raised by 80% from the default sound volume. Meanwhile, optional Com=Vol=*** is valid until the next Com=Vol=***. 
   Moreover, in the speech read-out file, [II] is replaced by [two] in association with the reading a of pronunciation=“two” stated in the tagged file. 
   The document processing apparatus generates the above-described speech read-out file through the sequence of steps shown in FIG.  11 . 
   First, the document processing apparatus at step S 11  analyzes the tagged file, received or formulated, as shown in FIG.  11 . The document processing apparatus checks the language with which the document is formulated, while searching the paragraphs in the document, beginning portions of the sentence and the phrases, and the reading attribute information, based on tags. 
   The document processing apparatus at step S 12  embeds Com=Lang=*** at the document beginning portion, by the CPU  13 , depending on the language with which the document is formulated. 
   The document processing apparatus then substitutes the attribute information in the speech read-out file by the CPU  13  for the beginning portions of the paragraphs, sentences and phrases of the document. That is, the document processing apparatus substitutes Com=begin_p, Com=begin_s and Com=begin_ph for the &lt;paragraph&gt;, &lt;sentence&gt; and &lt;***phrase&gt; in the tag file, respectively. 
   The document processing apparatus then unifies at step S 14  the same Com=begin_*** overlapping due to the same level syntactic structure into the sole Com=begin_*** by the CPU  13 . 
   The document processing apparatus then embeds at step S 15  Pau=*** in association with Com=begin_*** by the CPU  13 . That is, the document processing apparatus embeds Pau=500 directly before Com=begin_p, while embedding Pau=100 and Pau=50 directly before Com=begin_s and Com=begin_ph, respectively. 
   At step S 16 , the document processing apparatus substitutes correct reading by the CPU  13  based on the reading attribute information. That is, the document processing apparatus removes “  (uttered as “tan-paku”))” based on the reading attribute information of pronunciation=“null”, while substituting   (uttered as “rinpa-kan”)” and “  (uttered as “sumika”)” for the “  (lymphatic vessel, uttered as “rinpa-kan”)” and for the “  (abode, uttered as “sumika”)”, based on the reading attribute information of the pronunciation=“  (uttered as “rinpa-kan”)” and on the reading attribute information of the pronunciation=“  (uttered as “sumika”)”. 
   At step S 2  shown in  FIG. 4 , the document processing apparatus performs the processing shown in  FIG. 1  to generate the speech read-out file automatically. The document processing apparatus causes the speech read-out file so generated in the RAM  14 . 
   The processing for employing the speech read-out file at step S 3  in  FIG. 4  is explained. Using the speech read-out file, the document processing apparatus performs processing suited to the speech synthesis engine pre-stored in the ROM  15  or in the hard disc under control by the CPU  13 . 
   Specifically, the document processing apparatus selects the speech synthesis engine used based on the attribute information Com=Lang=*** embedded in the speech read-out file. The speech synthesis engine has identifiers added in keeping with the language or with the distinction between male and female speech. The corresponding information is recorded as e.g., initial setting file on a hard disc. The document processing apparatus references the initial setting file to select the speech synthesis engine of the identifier associated with the language. 
   The document processing apparatus also converts the Com=begin_***, embedded in the speech read-out file, into a form suited to the speech synthesis engine. For example, the document processing apparatus marks the Com=begin_p with a number of the order of hundreds such as by Mark=100, while marking the Com=begin_s with a number of the order, of thousands such as by Mark=1000 and marking the Com=begin_s with a number of the order of ten thousands such as by Mark=10000. 
   Since the attribute information for the sound volume is represented by percent of the increase to the default sound volume, such as by Vol=***, the document processing apparatus finds the sound volume on conversion of the percent information into the absolute value information based on this attribute information. 
   By performing the processing employing the speech read-out file at step S 3  in  FIG. 4 , the document processing apparatus converts the speech read-out file into a form which permits the speech synthesis engine to read out the speech read-out file. 
   The operation employing the user interface at step S 4  in  FIG. 4  is now explained. The document processing apparatus acts on e.g., a mouse of the input unit  20  to thrust the read-out executing button  114  or read-out execution button  144  shown in  FIGS. 5 and 6  to boot the speech synthesis engine. The document processing apparatus causes a user interface window  170  shown in  FIG. 12  to be demonstrated on the display unit  31 . 
   The user interface window  170  includes a replay button  171  for reading out the document, a stop button  172  for stopping the reading and a pause button  173  for transiently stopping the reading, as shown in FIG.  12 . The user interface window  170  also includes a button for locating including rewind and fast feed. Specifically, the user interface window  170  includes a locating button  174 , a rewind button  175  and a fast feed button  176  for locate, rewind and fast feed on the sentence basis, a locating button  177 , a rewind button  178  and a fast feed button  179  for locate, rewind and fast feed on the paragraph basis, and, a locating button  180 , a rewind button  181  and a fast feed button  182  for locate, rewind and fast feed on the phrase basis. The user interface window  170  also includes selection switches  183 ,  184  for selecting whether the object to be read is to be the entire text or a summary text prepared as will be explained subsequently. Meanwhile, the user interface window  170  may include a button for increasing or decreasing the sound volume, a button for increasing or decreasing the read out rate, a button for changing the voice of the male/female speech, and so on. 
   The document processing apparatus performs the operation of reading out by the speech synthesis engine by the user acting on the various buttons/switches by thrusting/selecting e.g., the mouse of the input unit  20 . For example, if the user thrusts the replay button  171  to start reading the document out, whereas, if the user thrusts the locating button  174  during reading, the document processing apparatus jumps to the start position of the sentence currently read out to re-start reading. By the marking made st step S 3  in  FIG. 4 , the document processing apparatus is able to make mark-based jump when reading out. That is, if the user thrusts the rewind button  178  or the fast button  179 , using e.g., the mouse of the input unit  20 , the document processing apparatus discriminates only marks indicating the start position of the paragraph for the number of the order of hundreds, such as Mark=100, to make the jump. In a similar manner, if the user thrusts the rewind button  175 , fast feed button  176 , rewind button  181  and the fast feed button  182 , using e.g., the mouse of the input unit  20 , the document processing apparatus discriminates only the marks indicating the beginning positions of the sentences and phrases having the numbers of the orders of thousands and ten thousands, such as Mark=1000 or Mark=10000, to make a jump. Thus, the document processing apparatus makes a jump based on the paragraph or phrase basis at the time of reading out the document to respond to the request such as the request for repeated replay of the document portion desired by the user. 
   The document processing apparatus causes the speech synthesis engine to read out the document by the user performing the processing employing the user interface at step S 4 . The information thus read out is output from the speech output unit  30 . 
   In this manner, the document processing apparatus is able to read the desired document by the speech synthesis engine without extraneous feeling. 
   The reading out processing in case the summary text is formulated is now explained. Here, the processing of formulating the summary text from the tagged document is explained with reference to  FIGS. 13  to  21 . 
   If a document is to be prepared in the document processing apparatus, the user acts on the input unit  20 , as the document is displayed on the display unit  31 , to command execution of the automatic summary creating mode. That is, the document processing apparatus drives the hard disc drive  34 , under control by the CPU  13 , to boot the automatic summary creating mode of the electronic document processing program stored in the hard disc. The document processing apparatus controls the display unit  31  by the CPU  13  to demonstrate an initial picture for the automatic document processing program shown in FIG.  13 . The window  190 , demonstrated on the display unit  31 , is divided into a display area  200  for displaying a document name display portion  191 , for demonstrating the document name, a key word input portion  192  for inputting a key word, and a summary text creating button  193 , as an execution button for preparing the summary text of the document, a document display area  210  and a document summary text display area  220 . 
   In the document name display portion  191  of the display area  200  is demonstrated the name etc., of the document demonstrated on the display area  210 . In the key word input portion  192  is input a keyword for preparing the summary text of the document using e.g., a key word for formulating the document. The summary text creating button  193  is a button for starting the processing of formulating the summary of the document demonstrated on the display area  210  on pushing e.g., a mouse of the input unit  20 . 
   In the display area  210  is demonstrated the document. On the right end of the document display area  210  are provided a scroll bar  211  and buttons  212 ,  213  for vertically moving the scroll bar  211 . If the user directly moves the scroll bar  211  in the up-and-down direction, using the mouse of e.g., the input unit  20 , or thrusts the buttons  212 ,  213  to move the scroll bar  211  vertically, the display contents on the document display area  210  can be scrolled vertically. The user is also able to act on the input unit  20  to select a portion of the document demonstrated on the display area  210  to formulate a summary or a summary of the entire text. 
   In the display area  220  is demonstrated the summary text. Since the summary text has as yet not been formulated, nothing is demonstrated in  FIG. 13  on the display area  220 . The user may act on the input unit  20  to change the display area (size) of the display area  220 . Specifically, the user may enlarge the display area (size) of the display area  220 , as shown for example in FIG.  14 . 
   If the user pushes the summary text creating button  193 , using e.g., a mouse of the input unit  20 , to set an on-state, the document processing apparatus executes the processing shown in  FIG. 15  to start the preparation of the summary text, under control by the CPU  13 . 
   The processing for creating the summary text from the document is executed on the basis of the tagging pertinent to the inner document structure. In the document processing apparatus, the size of the display area  220  of the window  190  can be changed, as shown in FIG.  14 . If, after the window  190  is newly drawn on the display unit  31 , under control by the CPU  13 , or the size of the display area  220  is changed, the summary text creating button  193  is thrust, the document processing apparatus executes the processing of preparing the summary text, from the document at least partially demonstrated on the display area  210  of the window  190 , so that the summary text will fit in the display area  220 . 
   First, the document processing apparatus performs, at step S 21 , the processing termed active diffusion, under control by the CPU  13 . In the present embodiment, the summary text of the document is prepared by adopting a center active value, obtained by the active diffusion, as the degree of criticality. That is, in the document tagged with respect to its inner structure, each element may be added by this active diffusion with a center active value corresponding to tagging pertinent to its inner structure. 
   The active diffusion is the processing of adding the maximum center active value even to elements pertinent to elements having high center active values. Specifically, in active diffusion, the center active value is equal between an element represented in anaphora (co-reference) and its antecedent, with each center active value converging to the same value otherwise. Since the center active value is determined responsive to the tagging pertinent to the inner document structure, the center active value can be exploited for document analyses which takes the inner document structure into account. 
   The document processing apparatus executes active diffusion by a sequence of steps shown in FIG.  16 . 
   The document processing apparatus first initializes each element, at step S 41 , under control by the CPU  13 , as shown in FIG.  16 . The document processing apparatus allocates an initial center active value to each of the totality of elements excluding the vocabulary elements and to each of the vocabulary elements. For example, the document processing apparatus allocates “1” and “0”, as the initial center active values, to each of the totality of elements excluding the vocabulary elements and to each of the vocabulary elements. The document processing apparatus is also able to allocate a non-uniform value as the initial center active value of each element at the outset to get the offset in the initial value reflected in the center active value obtained on active diffusion. For example, in the document processing apparatus, a higher initial center active value may be set for elements in which the user is interested to achieve the center active value which reflects the user&#39;s interest. 
   As for the referencing/referenced link, as a link having the modifying/modified relation by the referencing/referenced relation between elements, and normal links, as other links, a terminal point active value at terminal points of the link interconnecting the elements is set to “0”. The document processing apparatus causes the initial terminal point active value, thus added, to be stored in the RAM  14 . 
   A typical element-to-element connecting structure is shown in  FIG. 17 , in which an element E i  and an element E j  as part of the structure of the element and the link making up a document. The element E i  and the element E j , having center active values of e i  and e j , respectively, are interconnected by a link L ij . The terminal points of the link L ij  connecting to the element E i  and to the element E i  are T ij  and T ji , respectively. The element E i  is connected to elements E k , E l  and E m , not shown, through links L ik , L il  and Li im , respectively, in addition of to the element E j  connected over the link L ij . The element E j  is connected to elements E p , E q  and Er, not shown, through links L ip , L jq  and L jr , respectively, in addition of to the element E i  connected over the link L ji . 
   The document processing apparatus then at step S 42  of  FIG. 16  initializes a counter adapted for counting the element E i  of the document, under control by the CPU  13 . That is, the document processing apparatus sets the count value i of the element counting counter to “1”. So, the counter references the first element E i . 
   The document processing apparatus at step S 43  then executes the link processing of newly counting the center active value of the elements referenced by the counter, under control by the CPU  13 . This link processing will be explained later in detail. 
   At step S 44 , the document processing apparatus checks, under control by the CPU  13 , whether or not new center active values of the totality of elements in the document have been computed. 
   If the document processing apparatus has verified that the new center active values of the totality of elements in the document have been computed, the document processing apparatus transfers to the processing at step S 45 . If the document processing apparatus has verified that the new center active values of the totality of elements in the document have not been computed, the document processing apparatus transfers to the processing at step S 47 . 
   Specifically, the document processing apparatus verifies, under control by the CPU  13 , whether or not the count value i of the counter has reached the total number of the elements included in the document. If the document processing apparatus has verified that the count value i of the counter has reached the total number of the elements included in the document, the document processing apparatus proceeds to step S 45 , on the assumption that the totality of the elements have been computed. If conversely the document processing apparatus has verified that the count value i of the counter has not reached the total number of the elements included in the document, the document processing apparatus proceeds to step S 47 , on the assumption that the totality of the elements have not been computed. 
   If the document processing apparatus has verified that the count value i of the counter has not reached the total number of the elements making up the document, the document processing apparatus at step S 47  causes the count value i of the counter to be incremented by “1” to set the count value of the counter to “i+1”. The counter then references the i+1st element, that is the next element. The document processing apparatus then proceeds to the processing at step S 43  where the calculation of terminal point active value and the next following sequence of operations are performed on the next i+1st element. 
   If the document processing apparatus has verified that the count value i of the counter has reached the total number of the elements making up the document, the document processing apparatus at step S 45  computes an average value of the variants of the center active values of the totality of the elements included in the document, that is an average value of the variants of the newly calculated center active values with respect to the original center active values. 
   The document processing apparatus reads out the original center active values memorized in the RAM  14  and the newly calculated center active values with respect to the totality of the elements making up the document, under control by the CPU  13 . The document processing apparatus divides the sum of the variants of the newly calculated center active values with respect to the original center active values by the total number of the elements contained in the document to find an average value of the variants of the center active values of the totality of the elements. The document processing apparatus also causes the co-calculated average value of the variants of the center active values of the totality of the elements to be stored im e.g., the RAM  14 . 
   The document processing apparatus at step S 46  verifies, under control by the CPU  13 , whether or not the average value of the variants of the center active values of the totality of the elements, calculated at step S 45 , is within a pre-set threshold value. On the other hand, if the document processing apparatus finds that the variants are not within the threshold value, the document processing apparatus transfers its processing to step S 42  to set the count value i of the counter to “1” to execute again the sequence of steps of calculating the center active value of the elements of the document. In the document processing apparatus, the variants are decreased gradually each time the loop from step S 42  to step S 46  is repeated. 
   The document processing apparatus is able to execute the active diffusion in the manner described above. The link processing performed at step S 43  to carry out this active diffusion is now explained with reference to FIG.  18 . Meanwhile, although the flowchart of  FIG. 18  shows the processing on the sole element E i , this processing is executed on the totality of the elements. 
   First, at step S 51 , the document processing apparatus initializes the counter adapted for counting the link having its one end connected to an element E i  constituting the document, as shown in FIG.  18 . That is, the document processing apparatus sets the count value j of the link counting counter to “1”. This counter references a first link L ij  connected to the element E i . 
   The document processing apparatus then references at step S 52  a tag of the relational attribute on the link L ij  interconnecting the elements E i  and E j , under control by the CPU  13 , to verify whether or not the link L ij  is the normal link. The document processing apparatus verifies which one of the normal link showing the relation between the vocabulary element associated with a word, a sentence element associated with the sentence and a paragraph element associated with the paragraph and the reference link indicating the modifying/modified relation by the referencing/referenced relation is the link L ij . If the document processing apparatus finds that the link L ij  is the normal link, the document processing apparatus transfers its processing to step S 53 . If the document processing apparatus finds that the link L ij  is the reference link, it transfers its processing to step S 54 . 
   If the document processing apparatus verifies that the link L ij  is the normal link, it performs at step S 53  the processing of calculating a new terminal point active value of a terminal point T ij  of the element E i  connected to the normal link L ij . 
   At this step S 53 , the link L ij  has been clarified to be a normal link by the verification at step S 52 . The new terminal point active value t ij  of the terminal point T ij  of the element E i  may be found by summing terminal point active values t jp , t jq  and t jr  of the totality of the terminal points T jp , T jq  and T jr  connected to the links other than the link L ij , among the terminal point active values of the element E i , to the center active value e j  of the element E i  connected to the element E i  by the link L ij , and by dividing the resulting sum by the total number of the elements contained in the document. 
   The document processing apparatus reads out the terminal point active values and the center active values as required for e.g., the RAM  14 , and calculates a new terminal point active value of the terminal point connected to the normal link on the read-out terminal point and center active values. The document processing apparatus then causes the new terminal point active values, thus calculated, to be stored e.g., in the RAM  14 . 
   If the document processing apparatus finds that the link L ij  is not the normal link, the document processing apparatus at step S 54  performs the processing of calculating the terminal point active value of the terminal point T ij  connected to the reference link of the element E i . 
   At this step S 54 , the link L ij  has been clarified to be a reference link by the verification at step S 52 . The terminal point active value t ij  of the terminal point L ij  of the element E i  connected to the reference link L ij  may be found by summing terminal point active values t jp , t jq  and t jr  of the totality of the terminal points T jp , T jq  and t ij  connected to the links other than the link L ij , among the terminal point active values of the element E j , to the center active value e j  of the element E j  connected to the element E i  by the link L ij , and by dividing the resulting sum by the total number of the elements contained in the document. 
   The document processing apparatus reads out the terminal point active values and the center active values as required for e.g., the RAM  14 , and calculates a terminal point active value and a center active value from the terminal point active value and the center active value stored in the RAM  14 . The document processing apparatus calculates a new terminal point active value and a center active value, connected to the reference link as discussed above, using the read-out terminal point active value and center active value thus read out. The document processing apparatus then causes the new terminal point active values, thus calculated, to be stored e.g., in the RAM  14 . 
   The processing of the normal link at step S 53  and the processing of the reference link at step S 54  are executed on the totality of links L ij  connected to the element E i  referenced by the count value i, as shown by the loop proceeding from step S 52  to step S 55  and reverting through step S 57  to step S 52 . Meanwhile, the count value j counting the link connected to the element E i  is incremented at step S 57 . 
   After performing the processing of steps S 53  and S 54 , the document processing apparatus at step S 55  verifies, under control by the CPU  13 , whether or not the terminal point active values have been calculated for the totality of links connected to the element E i . If the document processing apparatus has verified that the terminal point active values have been calculated on the totality of links, it transfers the processing to step S 56 . If the document processing apparatus has verified that the terminal point active values have not been calculated on the totality of links, it transfers the processing to step S 57 . 
   If the document processing apparatus has found that the terminal point active values have been calculated on the totality of links, the document processing apparatus at step S 56  executes updating of the center active values e i  of the element E i , under control by the CPU  13 . 
   The new value of the center active value e i  of the element E i , that is an updated value, may be found by taking the sum of the curent center active value e i  of the element E i  and the new terminal point active values of the totality of the terminal points of the element E i , or e i ′=e i +Σt j ′. The prime symbol “′” means a new value. In this manner, the new center active value may be found by summing the original center active value of the element to the sum total of the new terminal point active value of the terminal point of the element. 
   The document processing apparatus reads out necessary terminal point active value from the terminal point active values and the center active values stored e.g., in the RAM  14 . The document processing apparatus executes the above-described calculations to find the center active value e j  of the element E i , and causes the so-calculated new center active value e j  to be stored in e.g., the RAM  14 . 
   In this manner, the document processing apparatus calculates the new center active value for each element in the document, and executes active diffusion shown at step S 21  in FIG.  15 . 
   At step S 22  in  FIG. 15 , the document processing apparatus sets the size of the display area  220  of the window  190  demonstrated on the display unit  31  shown in  FIG. 13 , that is the maximum number of characters that can be demonstrated on the display area  220 , to W s , under control by the CPU  13 . On the other hand, the document processing apparatus initializes the summary text S, under control by the CPU  13 , to set the initial value S o =. This denotes that no character queue is present in the summary text. The document processing apparatus causes the maximum number of characters W s  that can be demonstrated on the display area  220 , and the initial value S 0  of the summary S, thus set, to be memorized e.g., in the RAM  14 . 
   The document processing apparatus then sets at step S 23  the count value i of the counter for counting the sequential formulation of the skeleton of the summary text to “1”. That is, the document processing apparatus sets the count value i to i=1. The document processing apparatus causes the so-set count value i to be stored e.g., in the RAM  14 . 
   The document processing apparatus then extracts at step S 24  the skeleton of a sentence having the i&#39;th highest average center active value from the sentence, the summary text of which is to be prepared, for the count value i of the counter, under control by the CPU  13 . The average center active value is an average value of the center active values of the respective elements making up a sentence. The document processing apparatus reads out the summary text S i−1  stored in the RAM  14  and sums the letter queue of the skeleton of the extracted sentence to the summary S i−1  to give a summary text S i . The document processing apparatus causes the resulting summary text S i  to be stored e.g., in the RAM  14 . Simultaneously the document processing apparatus formulates a list l i  of the elements not contained in the sentence skeleton, in the order of the decreasing center active values, to cause the list l i  to be stored e.g., in the RAM  14 . 
   That is, at step S 24 , the document processing apparatus selects the sentences in the order of the decreasing average center active values, using the results of the active diffusion, under control by the CPU  13 , to extract the skeleton of the selected sentence. The sentence skeleton is constituted by indispensable elements extracted from the sentence. What can become the indispensable elements are elements having the relational attribute of a head of an element, a subject, an indirect object, a possessor, a cause, a condition or comparison, and elements directly contained in a coordinate structure in the relevant element retained to be the coordinate structure is an indispensable element. The document processing apparatus connects the indispensable elements to form a sentence skeleton to add it to the summary text. 
   The document processing apparatus then verifies, at step S 25 , whether or not the length of a summary S i , that is the number of letters, is more than the maximum number of letters W s  in the display area  220  of the window  190 , under control by the CPU  13 . 
   If the document processing apparatus verifies that the number of letters of the summary S i  is larger than the maximum number of letters W s , it sets at step S 30  the summary S i−1  as the ultimate summary text, under control by the CPU  13 , to finish a sequence of processing operations. Since the summary S i =S o =“” is output in this case, the summary text is not demonstrated on the display area  220 . 
   If conversely the document processing apparatus verifies that the number of letters of the summary S i  is not larger than the maximum number of letters W s , it transfers to processing at step S 26  to compare the center active value of the sentence having the (i+1) summary text largest average center active value to the center active value of the element having the largest center active value among the elements of the list l i  prepared at step S 24 , under control by the CPU  13 . If the document processing apparatus has verified that the center active value of the sentence having the (i+1) summary text largest center active value is larger than the center active value of the element having the largest center active value among the elements of the list l i , it transfers to processing at step S 28 . If conversely the document processing apparatus has verified that the center active value of the sentence having the (i+1) summary text largest center active value is larger than the center active value of the element having the largest center active value among the elements of the list l i , it transfers to processing at step S 27 . 
   If the document processing apparatus has verified that the center active value of the sentence having the (i+1) summary text largest center active value is not larger than the center active value of the element having the largest center active value among the elements of the list l i , it increments the count value i of the counter by “1” at step S 27 , under control by the CPU  13 , to then revert to the processing of step S 24 . 
   If the document processing apparatus has verified that the center active value of the sentence having the (i+1) summary text largest center active value is larger than the center active value of the element having the largest center active value among the elements of the list l i , it sums the element e with the largest center active value among the elements of the list l i  to the summary S i  to generate SS i  while deleting the element e from the list l i . The document processing apparatus causes the summary SS i  thus generated to be memorized in e.g., the RAM  14 . 
   The document processing apparatus then verifies, at step S 29 , whether or not the number of letters of the summary SS i  is larger than the maximum number of letters Ws of the display area  220  of the window  190 , under control by the CPU  13 . If the document processing apparatus has verified that the number of letters of the summary SS i  is not larger than the maximum number of letters W s  of the display area  220  of the window  190 , the document processing apparatus repeats the processing as from step S 26 . If conversely the document processing apparatus has verified that the number of letters of the summary SS i  is larger than the maximum number of letters W s , the document processing apparatus sets the summary S i  at step S 31  as being the ultimate summary text, under control by the CPU  13 , and displays the summary S i  to finish the sequence of operations. In this manner, the document processing apparatus generates the summary text so that its number of letters is not larger than the maximum number of letters W s . 
   By executing the above-described sequence of operations, the document processing apparatus formulates a summary text by summarizing the tagged document. If the document shown in  FIG. 13  is summarized, the document processing apparatus forms the summary text shown for example in  FIG. 19  to display the summary text in the display area  220  of the display range. 
   Specifically, the document processing apparatus forms the summary text: “TCP/IP   ARPANET       ARPANET   1969                 50 kbps       ARPANET     1964                                         which reads: “The history of the TCP/IP cannot be discussed if APPANET is discounted. The APPANET was initiated from a network of an extremely small scale which interconnected host computers of four universities and research laboratories on the west coast of North America in 1969. At the time, a main-frame general-purpose computer was developed in 1964. In light of this historical background, such project, which predicted the prosperity of future computer communication, may be said to be truly American”, to demonstrate the summary text in the display area  220 . 
   In the document processing apparatus, the user reading this summary text instead of the entire document is able to comprehend the gist of the document to verify whether or not the sentence is the desired information. 
   For adding the degree of importance to elements in the document, by the document processing apparatus, it is not necessary to use the above-described active diffusion, since the method of weighting words by the tf*id method and to use the sum total of the weights to the words appearing in the document as the degree of importance of the document, as proposed by K. Zechner. This method is discussed in detail in K. Zechner, Fast Generation of Abstracts from general domain text corpora by extracting relevant Sentences, In Proc. of the 16th International Conference on Computational Linguistics, pp. 986-989, 1996. For adding the degree of importance, any suitable methods other than those discussed above may be used. It is also possible to set the degree of importance based on a keyword input to the key word input portion  192  of the display area  200 . 
   Meanwhile, the document processing apparatus is able to enlarge the display range of the display area  220  of the window  190  demonstrated on the display unit  31 . If, with the formulated summary text displayed on the display area  220 , the display range of the display area  220  is changed, the information volume of the summary text can be changed responsive to the display range. In such case, the document processing apparatus performs the processing shown in FIG.  20 . 
   That is, the document processing apparatus is responsive to actuation by the user on the input unit  20 , at step S 61 , under control by the CPU  13 , to wait until the display range of the display area  220  of the window  190  demonstrated on the display unit  31  is changed. 
   If the display range of the display area  220  is changed, the document processing apparatus transfers to step S 62  ro measure the display range of the display area  220  under control by the CPU  13 . 
   The processing performed at steps S 63  to S 65  is similar to that performed at step S 22  et seq., such that the processing is finished when the summary text corresponding to the display range of the display area  220  is created. 
   That is, the document processing apparatus at step S 63  determines the total number of letters of the summary text demonstrated on the display area  220 , based on the measured result of the display area  220  and on the previously specified letter size. 
   The document processing apparatus at step S 64  selects sentences or words from the RAM  14 , under control by the CPU  13 , in the order of the decreasing degree of importance, so that the number of letters of the created summary as determined at step S 63  will not be exceeded. 
   The document processing apparatus at step S 65  joins the sentences or paragraphs selected at step S 64  to prepare a summary text which is demonstrated on the display area  220  of the display unit  31 . 
   The document processing apparatus, performing the above processing, is able to newly formulate the summary text conforming to the display range of the display area  220 . For example, if the user enlarges the display range of the display area  220  by dragging the mouse of the input unit  20 , the document processing apparatus newly forms a more detailed summary text to demonstrate the new summary text in the display area  220  of the window  190 , as shown in FIG.  21 . 
   That is, the document processing apparatus forms the following summary text: “TCP/IP   ARPANET       ARPANET     DOD                   1969           50 kbps         ARPANET   1945     ENIAC         1964   IC                                                     which reads: “The history of TCP/IP cannot be discussed if APPANET is discounted. The APPANET is a packet exchanging network for experimentation and research constructed under the sponsorship of the DARPA (Defence Advanced Research Project Agency) of the DOD (Department of Defence) of the Department of Defence. The APPANET was initiated from a network of an extremely small scale which interconnected host computers of four universities and research laboratories on the west coast of North America in 1969. Historically, the ENIAC, as the first computer in the world, was developed in 1945 in Pennsylvania University. It was a main frame general-purpose computer series, loaded with an IC as a theoretical device and which commenced the history of the third generation computer, in 1964, that marked the beginning of a usable computer. In light of this historical background, such project, which predicted the prosperity of future computer communication, may be said to be truly American” to demonstrate the summary text in the display area  220 . 
   So, if the summary text displayed in the document processing apparatus is too concise for understanding the outline of the document, the user may enlarge the display range of the display area  220  to reference a more detailed summary text having a larger information volume. 
   If, in the document processing apparatus, the summary text of a document is to be formulated as described above, and the signal recording pattern of the electronic document processing program, recorded on the ROM  15  or the hard disc, is booted by the CPU  13 , the document or the summary text can be read out by carrying out the sequence of steps shown in FIG.  22 . Here, the document shown in  FIG. 6  is taken as an example for explanation. 
   First, the document processing apparatus receives a tagged document at step S 71 , as shown in FIG.  22 . Meanwhile, the document is added with tags necessary for speech synthesis and is constructed as a tagged file shown in FIG.  8 . The document processing apparatus is also able to receive the tagged document and adds new tags necessary for speech synthesis to form a document. The document processing apparatus is also able to receive a non-tagged document to add tags inclusive of those necessary for speech synthesis to the received document to prepare a tagged file. This process corresponds to step S 1  in FIG.  4 . 
   The document processing apparatus then prepares at step S 72  a summary text of the document, by a method as described above, under control by the CPU  13 . Since the document, the summary text of which has now been prepared, is tagged as shown at step S 71 , the tags corresponding to the document are similarly added to the prepared summary text. 
   The document processing apparatus then generates at step S 73  a speech read-out file for the total contents of the document, based on the tagged file, under control by the CPU  13 . This speech read-out file is generated by deriving the attribute information for reading out the document from the tags included in the tagged file to embed this attribute information. 
   At this time, the document processing apparatus generates the speech read-out file by carrying out the sequence of steps shown in FIG.  23 . 
   First, the document processing apparatus at step S 81  analyzes the tagged file, received or formed, by the CPU  13 . At this time, the document processing apparatus checks the language with which the document is formed and finds out the beginning positions of the paragraphs, sentences and phrases of the document and the reading attribute information based on the tags. 
   The document processing apparatus at step S 82  embeds Com=Lang=***, by the CPU  13 , at the document beginning position, depending on the language with which the document is formed. Here, the document processing apparatus embeds Com=Lang=ENG at the document beginning position. 
   The document processing apparatus at step S 84  substitutes the attribute information in the speech read-out file by the CPU  13  for the beginning positions of the paragraphs, sentences and phrases of the document. That is, the document processing apparatus substitutes Com=begin_p, Com=begin_s and Com=begin_ph for the &lt;paragraph&gt;, &lt;sentence&gt; and &lt;***phrase&gt; in the tagged file, respectively. 
   The document processing apparatus then unifies at step S 84  the same Com=begin_*** overlapping due to the same level syntactic structure into the sole Com=begin_*** by the CPU  13 . 
   The document processing apparatus then embeds at step S 85  Pau=*** in association with Com=begin_*** by the CPU  13 . That is, the document processing apparatus embeds Pau=500 directly before Com=begin_p, while embedding Pau=100 and Pau=50 directly before Com=begin_s and Com=begin_ph, respectively. 
   At step S 86 , the document processing apparatus substitutes correct reading by the CPU  13  based on the reading attribute information. The document processing apparatus substitutes [two] for [II] based on the reading attribute information pronunciation=“two”. 
   The document processing apparatus then finds out at step S 87  the portion included in the summary text by the CPU  13 . 
   At step S 88 , the document processing apparatus embeds by the CPU  13  Com=Vol=*** depending on the portion included in the summary text found out at step S 87 . Specifically, the document processing apparatus embeds Com=Vol=80, on the element basis, at the beginning position of the portion of the entire contents of the document which is included in the summary text prepared at step S 72  in  FIG. 22 , while embedding the attribute information Com=Vol=0 in the beginning position of the remaining document portions. That is, the document processing apparatus reads out the portion included in the summary text with a sound volume increased 80% from the default sound volume. Meanwhile, the sound volume need not be increased by 80% from the default sound volume, but may be suitably modified. Depending on the document portion found out at step S 87 , the document processing apparatus may embed the attribute information specifying different speech synthesis engines, without embedding only Com=Vol=***, to vary the read-out voice between e.g., the male voice and the female voice, so that the summary text reading voice will differ from that reading out the document portion not included in the summary text. Thus, in the document processing apparatus, the document portion included in the summary text may be intoned in reading it out to instigate the user attention. 
   The document processing apparatus performs the processing shown in  FIG. 23  at step S 73  in  FIG. 22  to generate the speech read-out file automatically. The document processing apparatus causes the generated speech read-out file to be stored in the RAM  14 . Meanwhile, this process corresponds to step S 2  in FIG.  4 . 
   At step S 74  in  FIG. 22 , the document processing apparatus performs processing suited to the speech synthesis engine pre-stored in the ROM  15  or in the hard disc, under control by the CPU  13 . This process corresponds to step S 3  in FIG.  4 . 
   The document processing apparatus at step S 75  performs the processing conforming to the user operation employing the above-mentioned user interface. This process corresponds to the step S 4  in FIG.  4 . By the user selecting a selection switch  184  of the user interface window  170  shown in  FIG. 12 , the summary text prepared at step S 72  may be selected as an object to be read out. In this case, the document processing apparatus may start to read the summary text out if the user pushes the replay button  171  by the user acting on e.g., the mouse of the input unit  20 . Also, if the user selects the selection switch  183  using the mouse of the input unit  20  to press the replay button  171 , the document processing apparatus starts reading the document out, as described above. In this case, the document processing apparatus is able to read out the summary text with pause periods different at the beginning positions of the paragraphs, sentences and phrases based on the attribute information Pau=*** embedded at step S 73  in the speech read-out file. Moreover, the document processing apparatus may read out the document not only by increasing the sound volume of the voice for the document portion included in the summary text but also by emphasizing the accents as necessary or by reading out the document portion included in the summary text with a voice having different characteristics from those of the voice reading out the document portion not included in the summary text. 
   By performing the above processing, the document processing apparatus can read out a given text or a summary text formulated. On the other hand, the document processing apparatus in reading out a given document is able to change the manner of reading out the document depending on the formulated summary text such as by intoning the document portion included in the formulated summary text. 
   As described above, the document processing apparatus is able to generate the speech read-out file automatically from a given document to read out the document or the summary text prepared therefrom using a proper speech synthesis engine. At this time, the document processing apparatus is able to increase the sound volume of the document portion included in the summary text prepared to intone the document portion to instigate user&#39;s attention. Also, the document processing apparatus discriminates the beginning portions of the paragraphs, sentences and phrases, and provides respective different pause periods at respective beginning portions. Thus, natural reading without extraneous feeling can be achieved. 
   The present invention is not limited to the above-described embodiment. For example, the tagging to the document or the speech read-out file is, of course, not limited to that described above. 
   Although the document is transmitted in the above-described embodiment to the communication unit  22  from outside over the telephone network, the present invention is not limited to this embodiment. For example, the present invention may be applied to a case in which the document is transmitted over a satellite, while it may also be applied to a case in which the document is read out from a recording medium  33  in a recording and/or reproducing unit  32  or in which the document is recorded from the outset in the ROM  15 . 
   Although the speech read-out file is prepared from the tagged file received or formulated, it is also possible to directly read out the tagged file without preparing such speech read-out file. 
   In this case, the document processing apparatus may discriminate the paragraphs, sentences and phrases, after receiving or preparing the tagged file, using the speech synthesis engine, based on tags appended to the tagged file for indicating the paragraphs, sentences and phrases, to read out the file with a pre-set pause period at the beginning portions of these paragraphs, sentences and phrases. The tagged file is added with the attribute information for inhibiting the reading out or indicating the pronunciation. So, the document processing apparatus reads the tagged file out as it removes the passages for which the reading out is inhibited, and as it substitutes the correct reading or pronunciation. The document processing apparatus is also able to execute locating, fast feed and rewind in reading out the file from one paragraph, sentence or phrase to another, based on tags indicating the paragraph, sentence or phrase, by the user acting on the above-mentioned user interface during reading out. 
   In this manner, the document processing apparatus is able to directly read the document out based on the tagged file, without generating a speech read-out file. 
   Moreover, according to the present invention, a disc-shaped recording medium or a tape-shaped recording medium, having the above-described electronic document processing program recorded therein, may be furnished as the recording medium  33 . 
   Although the mouse of the input unit  20  is shown as an example as a device for acting on variable windows demonstrated on the display unit  31 , the present invention is also not to be limited thereto since a tablet or a write pen may be used as this sort of the device. 
   Although the documents in English and Japanese are given by way of illustration in the above-described embodiments, the present invention may. Of course, be applied to any optional languages. 
   The present invention can, of course, be modified in this manner without departing its scope. 
   INDUSTRIAL APPLICABILITY 
   The electronic document processing apparatus according to the present invention, for processing an electronic document, described above, includes document inputting means fed with an electronic document, and speech read-out data generating means for generating speech read-out data for reading out by a speech synthesizer based on an electronic document. 
   Thus, the electronic document processing apparatus according to the present invention is able to generate speech read-out data based on the electronic document to read out an optional electronic document by speech synthesis to high precision without extraneous feeling. 
   The electronic document processing method according to the present invention includes a document inputting step of being fed with an electronic document and a speech read-out data generating step of generating speech read-out data for reading out on the speech synthesizer based on the electronic document. 
   Thus, the electronic document processing method according to the present invention is able to generate speech read-out data based on the electronic document to read out an optional electronic document by speech synthesis to high precision without extraneous feeling. 
   Moreover, the recording medium, having an electronic document processing program recorded thereon, according to the present invention, is a recording medium having recorded thereon a computer-controllable electronic document processing program for processing the electronic document. The program includes a document inputting step of being fed with an electronic document and a speech read-out data generating step of generating speech read-out data for reading out on the speech synthesizer based on the electronic document. 
   So, with the recording medium, having the electronic document processing program for processing the electronic document, recorded thereon, according to the present invention, there may be provided an electronic document processing program for generating speech read-out data based on the electronic document. Thus, an apparatus furnished with this electronic document processing program, is able to read an optional electronic document out to high accuracy without extraneous feeling by speech synthesis using the speech read-out data. 
   Moreover, the electronic document processing apparatus according to the present invention includes document inputting means for being fed with the electronic document of a hierarchical structure having a plurality of elements and to which is added the tag information indicating the inner structure of the electronic document, and document read-out means for speech-synthesizing and reading out the electronic document based on the tag information. 
   So, with the electronic document processing apparatus, according to the present invention, fed with the electronic document of a hierarchical structure having a plurality of elements and to which is added the tag information indicating its inner structure, the electronic document can be directly read out with high accuracy without extraneous feeling based on the tag information added to the document. 
   With the electronic document processing apparatus, according to the present invention, includes an electronic document processing method for processing an electronic document, including a document inputting step of being fed with the electronic document of a hierarchical structure having a plurality of elements and to which is added the tag information indicating the inner structure of the electronic document, and a document read-out step of speech-synthesizing and reading out the electronic document based on the tag information. 
   So, with the electronic document processing method, according to the present invention, fed with the electronic document of a hierarchical structure having a plurality of elements and to which is added the tag information indicating its inner structure, the electronic document can be directly read out with high accuracy without extraneous feeling based on the tag information added to the document. 
   In the recording medium, having recorded thereon an electronic document processing program, recorded thereon, there may be provided a computer-controllable electronic document processing program including a document inputting step of being fed with the electronic document of a hierarchical structure having a plurality of elements and having added thereto the tag information indicating its inner structure and a document read-out step of speech-synthesizing and reading out the electronic document based on the tag information. 
   So, with the recording medium, having recorded thereon an electronic document processing program, recorded thereon, according to the present invention, there may be provided an electronic document processing program having a step of being fed with the electronic document of a hierarchical structure having a plurality of elements and having the tag information indicating its inner structure and a step of directly reading out the electronic document high accurately without extraneous feeling. Thus, the device furnished with this electronic document processing program is able to be fed with the electronic document to read out the document highly accurately without extraneous feeling. 
   With the electronic document processing apparatus, according to the present invention, provided with summary text forming means for forming a summary text of the electronic document, and speech read-out data generating means for generating speech read-out data for reading the electronic document out by a speech synthesizer, in which the speech read-out data generating means generates the speech read-out data as it adds the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text. 
   So, with the electronic document processing apparatus, according to the present invention, in which the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text is added to generate speech read-out data, any optional electronic document may be read out highly accurately without extraneous feeling using the speech read-out data with emphasis as to the crucial portion included in the summary text. 
   The electronic document processing method, according to the present invention, includes a summary text forming step of forming a summary text of the electronic document and a speech read-out data generating step of generating speech read-out data for reading the electronic document out by a speech synthesizer. The speech read-out data generating step generates the speech read-out data as it adds the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text. 
   So, with the electronic document processing method, according to the present invention, in which the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text is added to generate speech read-out data, any optional electronic document may be read out highly accurately without extraneous feeling using the speech read-out data with emphasis as to the crucial portion included in the summary text. 
   In the recording medium having recorded thereon a computer-controllable program for processing an electronic document, according to the present invention, the program includes a summary text forming step of forming a summary text of the electronic document and a speech read-out data generating step of generating speech read-out data for reading the electronic document out by a speech synthesizer. The speech read-out data generating step generates the speech read-out data as the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text. 
   So, with the recording medium having recorded thereon the electronic document processing program, according to the present invention, there may be provided such a program in which the attribute information indicating reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text is added to generate speech read-out data. Thus, an apparatus furnished with this electronic document processing program is able to read any optional electronic document out highly accurately without extraneous feeling using the speech read-out data with emphasis as to the crucial portion included in the summary text. 
   The electronic document processing apparatus according to the present invention, includes summary text forming means for preparing a summary text of the electronic document and document read-out means for reading out a portion of the electronic document included in the summary text with emphasis as compared to a portion thereof not included in the summary text. 
   So, the electronic document processing apparatus according to the present invention is able to read any optional electronic document out highly accurately without extraneous feeling using the speech read-out data with emphasis as to the crucial portion included in the summary text. 
   The electronic document processing method according to the present invention includes a summary text forming step for forming a summary text of the electronic document and a document read out step of reading out a portion of the electronic document included in the summary text with emphasis as compared to the portion thereof not included in the summary text. 
   So, the electronic document processing method according to the present invention renders it possible to read any optional electronic document out highly accurately without extraneous feeling using the speech read-out data with emphasis as to the crucial portion included in the summary text. 
   In the recording medium having recorded thereon the electronic document processing program, according to the present invention, there may be provided such a program including a summary text forming step for forming a summary text of the electronic document and a document read out step of reading out a portion of the electronic document included in the summary text with emphasis as compared to the portion thereof not included in the summary text. 
   So, with the recording medium having recorded thereon the electronic document processing program, according to the present invention, there may be provided such an electronic document processing program which enables the portion of the electronic document contained in the summary text to be directly read out with emphasis as compared to the document portion not contained in the summary text. Thus, an apparatus furnished with this electronic document processing program is able to read any optional electronic document out highly accurately without extraneous feeling using the speech read-out data with emphasis as to the crucial portion included in the summary text. 
   The electronic document processing apparatus for processing an electronic document according to the present invention includes detection means for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and speech read-out data generating means for reading the electronic document out by the speech synthesizer by adding to the electronic document speech read-out data the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase based on detected results obtained by the detection means. 
   So, with the electronic document processing apparatus, according to the present invention, the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase is added to generate speech read-out data whereby speech read-out data may be read out highly accurately without extraneous feeling by speech synthesis by generating speech read-out data by providing different pause periods at beginning positions of at least two of the paragraph, sentence and phrase. 
   The electronic document processing method for processing an electronic document according to the present invention includes a detection step of detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document and a speech read-out data generating step of reading the electronic document out by the speech synthesizer by adding to the electronic document speech read-out data the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase based on detected results obtained by the detection means. 
   So, with the electronic document processing method for processing an electronic document, according to the present invention, the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase to generate speech read-out data is added to render it possible to read any optional electronic document out highly accurately without extraneous feeling using the speech read-out data. 
   In the recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, according to the present invention, the program includes a detection step of detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and a step of generating speech read-out data for reading out in a speech synthesizer by adding to the electronic document the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase. 
   So, with the recording medium, having recorded thereon the electronic document processing program, according to the present invention, the attribute information indicating providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase, is added to generate speech read-out data. Thus, an apparatus furnished with this electronic document processing program is able to read any optional electronic document out highly accurately without extraneous feeling using the speech read-out data. 
   The electronic document processing apparatus for processing an electronic document according to the present invention includes detection means for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and document read out means for speech-synthesizing and reading out the electronic document by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase, based on the result of detection by the detection means. 
   Thus, the electronic document processing apparatus, according to the present invention, is able to directly read out any optional electronic document by speech synthesis by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase. 
   The electronic document processing method for processing an electronic document according to the present invention includes a detection step for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and a document read out step for speech-synthesizing and reading out the electronic document by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase, based on the result of detection by the detection step. 
   So, the electronic document processing method for processing an electronic document renders it possible to read any optional electronic document out highly accurately without extraneous feeling by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase. 
   In the recording medium having recorded thereon a computer-controllable electronic document processing program for processing an electronic document, according to the present invention, the program includes a detection step for detecting beginning positions of at least two of the paragraph, sentence and phrase among plural elements making up the electronic document, and a document read out step for speech-synthesizing and reading out the electronic document by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase, based on the result of detection by the detection step. 
   So, with the recording medium having recorded thereon the electronic document processing program, according to the present invention, there may be provided an electronic document processing program which allows to directly read out any optional electronic document by providing respective different pause periods at beginning positions of at least two of the paragraph, sentence and phrase. Thus, an apparatus furnished with this electronic document processing program is able to read any optional electronic document out highly accurately without extraneous feeling by speech synthesis.