KR102045050B1 - Electronic book device and method for navigation of electronic book content thereof - Google Patents

Electronic book device and method for navigation of electronic book content thereof Download PDF

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KR102045050B1
KR102045050B1 KR1020160154974A KR20160154974A KR102045050B1 KR 102045050 B1 KR102045050 B1 KR 102045050B1 KR 1020160154974 A KR1020160154974 A KR 1020160154974A KR 20160154974 A KR20160154974 A KR 20160154974A KR 102045050 B1 KR102045050 B1 KR 102045050B1
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navigation
book
information
level
book content
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KR1020160154974A
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KR20180057758A (en
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유초롱
길연희
김희권
신희숙
이수웅
이영운
이지수
지형근
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한국전자통신연구원
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/954—Navigation, e.g. using categorised browsing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/30—Creation or generation of source code
    • G06F8/38—Creation or generation of source code for implementing user interfaces

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Abstract

According to an aspect of the present invention, there is provided a method of navigating e-book content in an e-book device, the method comprising: checking whether the first navigation information is present in the e-book content; If the first navigation information exists, setting a navigation level based on the first navigation information and reconstructing the navigation information based on the set navigation level, wherein reconstructing the navigation information includes: And reconstructing the navigation information by collecting the navigation level corresponding to the criterion of the navigation level, setting the navigation movement position information to be displayed on the e-book terminal.

Description

ELECTRONIC BOOK DEVICE AND METHOD FOR NAVIGATION OF ELECTRONIC BOOK CONTENT THEREOF}

The present invention relates to an e-book terminal and a method for navigating its e-book content.

Recently, with the spread of various mobile devices, e-books that can be easily played regardless of time and place through mobile and portable terminals are widely used.

Such an e-book is a concept that, according to Wikipedia, refers to a publication that processes and stores the contents of the book as digital information. In addition, it may be referred to as a file of a special format that can be viewed on a mobile device or a computer.

In general, an electronic book is not a general file format such as a text file, but a file having a special format that can be equipped with a digital right management (DRM) function for copyright protection.

E-book content, on the other hand, contains a variety of content ranging from tens of pages to hundreds of pages.

Conventional e-book contents generally provided navigation of e-book contents based on the table of contents set during the authoring process.

However, in the prior art, navigation in which the e-book consumer can easily find and move to a desired page is not easy in a large amount of e-book content.

Therefore, there is a need for a technology for easily and easily navigating e-book content at high speed.

In this regard, Korean Patent Laid-Open Publication No. 10-2013-0131820 (name of the invention: a technique for quickly searching the contents of a book in an e-book) is a method of searching for a desired book among many books in an e-book. Disclosed is a technique for searching for a desired book by displaying the number of books from the first book to the last book, and displaying a thumbnail and the number of books when passing by touch.

An embodiment of the present invention provides an e-book terminal and a method of navigating e-book contents thereof that can navigate an e-book at high speed through a touch interface based on the document structure of the e-book content.

However, the technical problem to be achieved by the present embodiment is not limited to the technical problem as described above, and other technical problems may exist.

As a technical means for achieving the above-described technical problem, the method for navigating the e-book content in the e-book terminal according to the first aspect of the present invention comprises the steps of checking the presence of the first navigation information in the e-book content ; If the first navigation information exists, setting a navigation level based on the first navigation information and reconstructing the navigation information based on the set navigation level. In this case, the reconstructing of the navigation information may include reconstructing the navigation information by collecting a navigation level corresponding to a criterion of the navigation level, setting navigation movement position information to be displayed on the e-book terminal.

In addition, an e-book terminal capable of navigating e-book content according to a second aspect of the present invention includes a communication module for transmitting and receiving data with an e-book service system, a memory in which a program for navigation of the e-book content is stored, and stored in the memory. And a display module for displaying the processor for executing the program and the e-book content. At this time, when the processor executes the program, the processor determines whether the first navigation information exists in the e-book content, sets the navigation level based on the first navigation information, and corresponds to the navigation level standard. Reconstruct the navigation information by collecting the levels and setting the navigation movement position to be displayed on the display module.

According to any one of the problem solving means of the present invention described above, the contents of the vast amount of e-book content can be searched, the user can be provided with a navigation function that can be easily moved to the location of the desired e-book content have.

In addition, even if the position movement is incorrectly made by the navigation, the original position is stored, so the user can easily move to the position previously read.

1 is a diagram schematically illustrating an e-book service system according to an embodiment of the present invention.
2 is a block diagram of an e-book terminal according to an embodiment of the present invention.
3 is a functional block diagram of an e-book terminal according to an embodiment of the present invention.
4 is an example of navigation information included in e-book content.
5 is a flowchart of contents for reconstructing navigation information of electronic book content.
6 is a diagram for describing an example of a movement unit of navigation set according to a navigation level.
7 is a flowchart of a navigation process.
8 is an exemplary diagram of a touch interface for a navigation function.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention.

When a part of the specification is to "include" any component, which means that it may further include other components, except to exclude other components unless otherwise stated.

The present invention relates to an e-book device 100 and a method of navigating e-book content in the e-book device 100.

According to an embodiment of the present invention, based on the document structure of the e-book content, the e-book can be quickly navigated through the touch interface.

Hereinafter, an e-book terminal 100 capable of navigating e-book content according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

1 is a diagram schematically illustrating an e-book service system 10 according to an exemplary embodiment of the present invention.

The e-book service system 10 according to an embodiment of the present invention includes an e-book authoring tool (server 10a) and an e-book service platform server 10b, and the e-book terminal 100 includes an e-book service system ( 10) e-book content is provided.

In this case, the e-book terminal 100 may be connected to the e-book service system 10 through a network. The network refers to a connection structure capable of exchanging information between respective nodes such as terminals and servers. Examples of such a network include a 3rd Generation Partnership Project (3GPP) network, a Long Term Evolution (LTE) network, and a WIMAX ( World Interoperability for Microwave Access Networks, Internet, Local Area Network (LAN), Wireless Local Area Network (WLAN), Wide Area Network (WAN), Personal Area Network (PAN), Bluetooth Network, Satellite Broadcast networks, analog broadcast networks, DMB (Digital Multimedia Broadcasting) networks, etc. include, but are not limited to these.

The e-book terminal 100 according to an embodiment of the present invention may be implemented as a separate e-book terminal implemented in hardware, or may be a smart terminal in which the e-book viewer is developed as software and loaded with the corresponding software.

Such a smart terminal is, for example, a wireless communication device that guarantees portability and mobility, that is, a personal communication system (PCS), a global system for mobile communications (GSM), a personal digital cellular (PDC), a personal handyphone system (PHS), and a PDA. All types of hands such as Personal Digital Assistant (IMT), International Mobile Telecommunication (IMT) -2000, Code Division Multiple Access (CDMA) -2000, W-Code Division Multiple Access (W-CDMA), and Wireless Broadband Internet (Wibro) terminals It may include a handheld based wireless communication device.

In addition, the e-book terminal 100 preferably includes a touch-based interface for navigation of the e-book content, but is not necessarily limited thereto, and the navigation function may be provided through the button-based interface.

The touch interface may include both a single touch interface and a multi-touch interface.

E-book authoring tool (10a) included in the e-book service system 10 according to an embodiment of the present invention is a standard form for the e-book content package containing the e-book content package containing additional information used for navigation of the e-book content It is generated so as not to violate and delivered to the e-book terminal 100.

The e-book service platform 10b may provide e-book content to the e-book terminal 100. In addition, the e-book terminal 100 may upload e-book content directly from the e-book authoring tool 10a.

The method of receiving the e-book content from the e-book service system 10 by the e-book terminal 100 may be variously changed according to service conditions and policies, and the present invention is not particularly limited thereto.

Hereinafter, the e-book terminal 100 according to an embodiment of the present invention will be described in more detail.

2 is a block diagram of an e-book terminal 100 according to an embodiment of the present invention. 3 is a functional block diagram of the e-book terminal 100 according to an embodiment of the present invention.

EPUB 3.0, an e-book standard form, provides navigation functions using a separate navigation file. However, in addition to the navigation file, it is necessary to include a table of contents (TOC) in the e-book content. In this case, the TOC included in the e-book content means the TOC for the detailed content in the table of contents defined in the navigation file.

The e-book device 100 according to an embodiment of the present invention has a navigation level for a navigation file, a TOC included in the e-book content, and all media (text, image, etc. in units of lines) included in the e-book content. And reconstruct the navigation information corresponding to the level.

First, referring to FIG. 2, the e-book terminal 100 includes a communication module 110, a memory 120, a processor 130, and a display 140 module.

The communication module 110 transmits and receives data with the e-book service system 10. Such a communication module 110 may include both a wired communication module and a wireless communication module. The wired communication module may be implemented as a power line communication device, a telephone line communication device, a cable home (MoCA), an Ethernet, an IEEE1294, an integrated wired home network, and an RS-485 control device. In addition, the wireless communication module may be implemented in a wireless LAN (WLAN), Bluetooth, HDR WPAN, UWB, ZigBee, Impulse Radio, 60GHz WPAN, Binary-CDMA, wireless USB technology and wireless HDMI technology.

The memory 120 stores a program for navigation of electronic book content. In this case, the memory 120 collectively refers to a nonvolatile storage device and a volatile storage device that maintain stored information even when power is not supplied.

For example, the memory 120 may include a compact flash (CF) card, a secure digital (SD) card, a memory stick, a solid-state drive (SSD), and a micro SD. Magnetic computer storage devices such as NAND flash memory such as cards, hard disk drives (HDDs), and optical disc drives such as CD-ROMs, DVD-ROMs, and the like. Can be.

The processor 130 executes a program stored in the memory 120, sets the navigation level based on the navigation information according to the execution of the program, collects the navigation level corresponding to the criteria of the set navigation level, and reads the e-book device. The navigation information is reconfigured by setting the navigation movement position to be displayed at 100.

The display module 140 displays the e-book content and provides a touch-based interface for navigation.

In more detail, referring to FIG. 3 to describe the function of the e-book terminal 100, the e-book terminal 100 includes an e-book service system linking unit 310, an e-book content management unit 320, and an e-book UX /. The UI interface unit 330, the e-book rendering unit 340, and the navigation unit 350 are included.

The e-book service system interworking unit 310 performs an interworking function for receiving e-book related information and e-book content from the e-book service system 10 located remotely.

In this case, if the e-book service system 10 provides an individual user management function, the e-book service system linking unit 310 may further include a user management function.

The e-book content management unit 320 receives and stores e-book contents from the e-book service system 10 and performs a function of integrating and managing the stored e-book contents. The e-book content management unit 320 includes a list management function for accessing the e-book content, a storage and management function of the e-book content.

The e-book UX / UI interface unit 330 is based on a touch interface that provides a touch input. At this time, the e-book UX / UI interface unit 330 targets the hardware touch interface provided by the e-book terminal 100, the touch interface of the Apple iOS-based device and Google's Android-based device each device manufacturer Depending on the touch interface specification of the bar may be different, the present invention is not particularly limited to such a standard.

The e-book UX / UI interface unit 330 targets the e-book terminal 100 using a touch interface (touch, swipe, etc.) defined for calling a viewer in a specific terminal in the e-book terminal 100. It performs a function for recognizing the touch interface input through the input.

In addition, it analyzes the touch input information input from the user, and performs a linkage function for mapping the analyzed touch input information with the function of the e-book terminal 100.

The e-book rendering unit 340 is a function for outputting e-book content, and includes a menu output function, an e-book content output function, and an external media content output function for the e-book viewer of the e-book terminal 100 as basic functions. Doing.

In addition, the e-book rendering unit 340 may further include a function of outputting a navigation level for high-speed navigation provided by an embodiment of the present invention and outputting navigation information for each level.

The navigation unit 350 performs a navigation information analysis function for integrating and analyzing navigation information included in the e-book content package and navigation information included in the e-book content, and a level setting function for setting the level by leveling the navigation; A navigation reconfiguration function for reconfiguring navigation information according to the set navigation level and an e-book navigation function for driving a navigation operation according to the set level are performed.

The navigation of the e-book content should be driven to search the location information of the reconstructed navigation according to the navigation level, and to be moved directly to the desired navigation location.

4 illustrates an example of navigation information (first navigation information P1 to be described below) included in e-book content.

Within the e-book content, navigation information P1 is included in a specific section. The navigation in the section unit is managed by storing a navigation file outside of the e-book content (second navigation information to be described below), but the navigation information P1 of the detailed section in the section is included in the e-book content as shown in FIG. Can be set.

E-book terminal 100 according to an embodiment of the present invention can be used by setting the navigation information up to the text sentence unit in the e-book content in the form as shown in Figure 4, through which to set the navigation level and reconstruct the navigation information Can be.

For reference, the components illustrated in FIGS. 1 to 3 according to an embodiment of the present invention may be implemented in software or hardware form such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC). Can play roles.

However, 'components' are not meant to be limited to software or hardware, and each component may be configured to be in an addressable storage medium or may be configured to reproduce one or more processors.

Thus, as an example, a component may include components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and subs. Routines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.

Components and the functionality provided within those components may be combined into a smaller number of components or further separated into additional components.

Hereinafter, a method of navigating e-book content in the e-book terminal 100 according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 8.

5 is a flowchart of contents for reconstructing navigation information of electronic book content.

E-book content navigation method according to an embodiment of the present invention, first, open the e-book content package to be read in the e-book viewer of the e-book terminal (S510), the e-book to be read from the e-book terminal 100 It is checked whether a navigation file exists in the package including the content (S520).

If the navigation file exists, the navigation file is analyzed to obtain second navigation information, and the obtained second navigation information is analyzed (S530).

Next, it is determined whether the first navigation information exists in the e-book content (S540), and if present, the navigation level is set based on this.

In this case, when the navigation file does not exist, the embodiment of the present invention may set the navigation level based only on the first navigation information (S550). On the other hand, when the navigation file exists, the navigation level may be set by utilizing both the first and second navigation information (S550).

Meanwhile, as illustrated in FIG. 4, the first navigation information may be read using a nav tag, and the mapping relationship between the read e-book content and the first navigation information must be maintained.

Here, the first navigation information is a Table of Content (TOC) included in the e-book content, and the second navigation information corresponds to information included in the navigation file provided by the standard of the e-book content.

According to an embodiment of the present invention, navigation information may be set and used in a text sentence and a single media unit in the e-book content. For this purpose, the navigation level is set by analyzing the first and second navigation information (S560).

The navigation level may be freely set according to the policy and the development method of the e-book viewer.

The navigation level may be set in units of one or more of a prolog, title, section, chapter, section, subsection, sentence, media, and page. For example, if the level of the navigation target information can be divided into title, sub, chapter, section, subsection, and sentence units, set the navigation level to 6 levels, which is the total number of units, or between the entire pages and chapters of the e-book content. In addition, the navigation level can be set automatically by adjusting the ratio programmatically according to the ratio of pages between sections.

The method of setting the navigation level is not limited thereto, and the navigation level may be set in various embodiments.

If the navigation level is set, the navigation information corresponding to the navigation level is reconstructed (S570).

The navigation information may be reconstructed by collecting a navigation level corresponding to a navigation level criterion and setting navigation movement position information to be displayed on the e-book terminal 100. In this case, the navigation movement position information may be provided to the user by setting only a few chapters, a few pages of information, or a title of a chapter, for example, when moving in units of chapters.

6 is a diagram for describing an example of a movement unit of navigation set according to a navigation level.

Referring to FIG. 6, based on the reconstructed information for navigating e-book content to a sentence level, step 1 is set to move by title and sub-unit, and step 2 is set to move by chapter. In step 3, it is set to move in sections. Subsequently, the level of detail may be further subdivided into detail sections, included media levels, and page levels, and the final N level may be set to move to the sentence level.

By reconfiguring the navigation information, various output information combinations may be provided, and information exposed by the user's setting may be selected in the e-book viewer. Alternatively, only information designated according to the policy of the e-book viewer may be exposed.

When the process of reconstructing the navigation information is completed, the e-book content is output to the display module 140.

Hereinafter, a process of navigating e-book content will be described with reference to FIGS. 7 and 8.

7 is a flowchart of a navigation process. 8 is an exemplary diagram of a touch interface for a navigation function.

The e-book content navigation method according to an embodiment of the present invention may further include navigating the e-book content based on the reconstructed navigation information.

First, after confirming the current position of the e-book content displayed on the display module 140 (S705), it is determined whether the current position is the last portion of the e-book content (S710). If it is determined that the last portion of the e-book content is output, the output of the e-book content is terminated (S760).

In contrast, when the middle portion of the e-book content is being output, the corresponding portion is maintained to be output (S715).

Next, it is determined whether the reconstructed navigation information exists (S720), and if it does not exist, the navigation is not possible, and thus, the process waits until the navigation information is reconstructed and checks the current position of the e-book content again. Goes.

In contrast, when the reconstructed navigation information exists, the navigation function may be started (S725).

Next, a selection input for the navigation level is received from the user or the navigation level is automatically set (S730). At this time, if the navigation level is not selected or automatically set by the user, it is again determined whether the reconstructed navigation information exists.

On the other hand, when the navigation level is selected by the user, the user taps (Tap), double taps (Double Tap), or long presses a specific position of the display module 140 to output a pop-up menu for setting the navigation level. Press operation can be performed.

When a popup menu for setting the navigation level is output and a navigation level is selected, a slide bar for navigation navigation or a navigation menu such as +/− may be output. Alternatively, as illustrated in FIG. 8, a navigation area for receiving a drag operation may be output.

When receiving the selection input for the navigation level, the reconstructed navigation information is output (S735), and the touch interface for moving position selection is activated (S740).

After the touch interface is activated, a control for navigation may be started as the horizontal or vertical specific region of the e-book terminal 100 is touched for a preset time or the navigation menu button of the e-book terminal 100 is input. have.

Control for navigation may be started together as the e-book terminal 100 is booted, or may be started through a specific input even while the user is outputting and viewing e-book contents.

As the control for such a navigation is started, a navigation area may be set in the e-book terminal 100 as shown in FIG. 8. When the user receives the dragging operation of the upper and lower P2 or the left and right P3 in the navigation region set as shown in FIG. 8, the navigation movement region may be searched.

In this case, the navigation level is determined according to the drag speed, and the navigation movement area may be searched to correspond to the navigation level according to the speed of the drag operation.

For example, dragging at the fastest speed provides one level of navigation, while dragging at the slowest speed provides N-level navigation.

Next, when the user selects a specific region from the searched navigation movement region (S745), the position information of the e-book content before the movement is stored (S750), and the user moves to the selected specific region (S755).

The user may move to a specific area corresponding to the selected navigation level by lightly pressing or long pressing the screen, for example.

On the other hand, in the above description, steps S510 to S755 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted as necessary, and the order between the steps may be changed. In addition, even if omitted, the contents already described in FIGS. 1 to 4 may be applied to the e-book contents navigation method of FIGS. 5 to 8.

According to any one of the embodiments of the present invention, it is possible to search the contents of the vast amount of e-book content, the user can be provided with a navigation function that can easily move to the desired location.

In addition, even if the position movement is incorrectly made by the navigation, the original position is stored, so the user can easily move to the position previously read.

On the other hand, the e-book content navigation method in the e-book terminal 100 according to an embodiment of the present invention is also in the form of a computer program stored in a medium executed by a computer or a recording medium including instructions executable by the computer. Can be implemented. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transmission mechanism, and includes any information delivery media.

Although the methods and systems of the present invention have been described in connection with specific embodiments, some or all of their components or operations may be implemented using a computer system having a general purpose hardware architecture.

The above description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

10: eBook Service System
10a: eBook authoring tool
10b: eBook Service Platform Server
100: e-book terminal
110: communication module
120: memory
130: processor
140: display module

Claims (10)

In the method of navigating the e-book content in the e-book terminal,
Confirming presence of first navigation information in the e-book content;
Setting a navigation level based on the first navigation information when the first navigation information exists;
Reconstructing navigation information based on the set navigation level; And
Navigating the e-book content based on the reconstructed navigation information,
The reconstructing of the navigation information may include reconstructing the navigation information by collecting a navigation level corresponding to a criterion of the navigation level, setting navigation movement position information to be displayed on the e-book device,
In the step of navigating the e-book content based on the reconstructed navigation information, a navigation area is set in the e-book terminal as the control of the navigation is started, and the navigation moving area is searched through a drag operation in the set navigation area. Become,
And the navigation level is determined according to the speed of the drag operation and the navigation movement area is searched to correspond to the navigation level according to the speed of the drag operation. The method of claim 1,
Confirming whether a navigation file exists in a package including e-book content to be read by the e-book terminal;
If the navigation file exists, further comprising the step of analyzing the navigation file to obtain second navigation information,
Setting the navigation level,
And setting the navigation level based on the first and second navigation information. The method according to claim 1 or 2,
And the navigation level is set in units of one or more of a prolog, a title, a part, a chapter, a verse, a detail verse, a sentence, a media, and a page. The method of claim 1,
In the step of navigating the e-book content based on the reconstructed navigation information, the control of the navigation is started.
The electronic book content navigation method according to any one of the case in which the horizontal or vertical specific region of the e-book terminal is touch input for a preset time or when the navigation menu button of the e-book terminal is input. delete delete The method of claim 1,
Navigating the e-book content,
Receiving an input from a user for a specific navigation level among the set navigation levels;
And outputting reconstructed navigation information corresponding to the specific navigation level. The method of claim 1,
Navigating the e-book content,
Selecting a specific area of the searched navigation movement area;
Moving to the selected specific region; and
And storing location information of the e-book content before the movement. The method of claim 8,
Selecting a specific area of the searched navigation movement area,
Activating an interface for receiving a selection input of the specific region. The method of claim 2,
The first navigation information is a Table of Content (TOC) contained in the e-book content, and the second navigation information is information contained in a navigation file provided by a standard of the e-book content. Way.
KR1020160154974A 2016-11-21 2016-11-21 Electronic book device and method for navigation of electronic book content thereof KR102045050B1 (en)

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