Patent Publication Number: US-2018049253-A1

Title: Electronic device and method for accessing internet

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is related to and claims priority under 35 U.S.C. §119(a) to Korean Patent Application No. 10-2016-0102380, filed Aug. 11, 2016, the entire content of which is hereby incorporated by reference. 
     TECHNICAL FIELD 
     The present disclosure generally relates to an electronic device, and more particularly to an electronic device for accessing the Internet, and a method thereof. 
     BACKGROUND 
     In order to meet the demand for wireless data traffic, which has been increasing since the commercialization of a fourth-generation (4G) communication system, efforts are being made to develop an improved fifth-generation (5G) communication system or pre-5G communication system. For this reason, a 5G communication system or pre-5G communication system is referred to as a “beyond-4G-network communication system” or “post-long-term evolution (LTE) system.” To achieve a high data transmission rate, implementing a 5G communication system in an extremely high frequency (mmwave) band (for example, a 60 GHz band) is being considered. To relieve the path loss of signals and to increase the transmission distance of signals in an extremely high frequency band, beamforming, massive multiple-input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large-scale antenna techniques are under discussion for a 5G communication system. Further, to improve the network of the system, technical development in an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, device-to-device (D2D) communication, wireless backhaul, a moving network, cooperative communication, coordinated multi-points (CoMP), and interference cancellation is progressing for the 5G communication system. In addition, an advanced coding modulation (ACM) scheme including hybrid frequency shift keying (FSK) and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) and an advanced access technique including filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are being developed in the 5G system. 
     Meanwhile, the Internet is evolving from a human-centered network, in which human beings generate and consume information, to an internet of things (IoT) network, in which distributed components including things exchange and process information. Internet-of-everything (IoE) technology, as a combination of big-data processing technology with IoT technology through connection via a cloud server, has also emerged. To implement IoT, technical elements including sensing techniques, wired/wireless communication and network infrastructures, service interface techniques, and security techniques are used. Accordingly, technologies for sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) are being studied in order to connect things. In an IoT environment, intelligent internet technology (IT) services may be provided which collect and analyze data generated from connected things to create new value in human lives. The IoT may be applied to the areas of a smart home, a smart building, a smart city, a smart car or connected car, a smart grid, health care, smart home appliances, and advanced medical care services through combination and integration of existing information technology (IT) technologies with diverse industries. 
     Accordingly, various attempts are being made to apply a 5G communication system to an IoT network. For example, 5G communication technologies including sensor network, M2M, and MTC technologies are implemented by beamforming, MIMO, and array antenna techniques. Applying a cloud radio access network as a big-data processing technology is one example of a combination of 5G technology and IoT technology. 
     With the development of communication technology, methods for conveniently using the Internet are becoming popular. For example, in order to conveniently use the Internet, a method of accessing the Internet using a domain name set with a combination of characters is proliferating among users. The method of accessing the Internet using the domain name may provide convenience to a user but utilizes an additional procedure, such as a procedure for obtaining an internet protocol (IP) address based on the domain name. That is, the method of accessing the Internet using the domain name may cause a delay. Accordingly, methods for reducing such a delay are being sought. 
     SUMMARY 
     To address the above-discussed deficiencies, it is a primary object to provide an electronic device for reducing a delay caused by a method of accessing the Internet using a domain name, and a method thereof. 
     An electronic device according to various exemplary embodiments of the present disclosure may include: a processor; a sensor configured to be operatively coupled to the processor; a communication unit configured to be operatively coupled to the processor; and a storage unit configured to be operatively coupled to the processor, wherein the processor may be configured to: detect a first input with respect to a first domain name; detect a second input with respect to a second domain name within a designated interval after the first input is detected; store the second domain name as a domain name associated with the first domain name in a storage unit included in the electronic device, in response to detection of the second input; and perform control to transmit a message for requesting information on an address corresponding to the first domain name and a message for requesting information on an address corresponding to the second domain name to a domain name system (DNS) server in response to detection of a third input with respect to the first domain name. 
     A method of an electronic device according to various exemplary embodiments of the present disclosure may include: detecting a first input with respect to a first domain name; detecting a second input with respect to a second domain name within a designated interval after the first input is detected; storing the second domain name as a domain name associated with the first domain name in a storage unit included in the electronic device, in response to detection of the second input; and transmitting a message for requesting information on an address corresponding to the first domain name and a message for requesting information on an address corresponding to the second domain name to a DNS server in response to detection of a third input with respect to the first domain name. 
     An electronic device and a method thereof according to various exemplary embodiments of the present disclosure may perform not only a DNS query about an input domain name but also a DNS query about a domain name associated with the input domain name, thereby reducing a delay caused by an Internet access method using a domain name. 
     Effects which can be acquired by the present disclosure are not limited to the above described effects, and other effects that have not been mentioned may be clearly understood by those skilled in the art from the following description. 
     Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. 
     Moreover, various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms “application” and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code. The phrase “computer readable program code” includes any type of computer code, including source code, object code, and executable code. The phrase “computer readable medium” includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. A “non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals. A non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: 
         FIG. 1  illustrates an example of a network structure for accessing the Internet according to various exemplary embodiments of the present disclosure; 
         FIG. 2  illustrates an example of signal flow between an electronic device accessing the Internet using a domain name, a DNS server, and a content server according to various exemplary embodiments of the present disclosure; 
         FIG. 3  illustrates an example of DNS signaling according to various exemplary embodiments of the present disclosure; 
         FIG. 4  illustrates an example of parallel DNS signaling according to various exemplary embodiments of the present disclosure; 
         FIG. 5  illustrates an example of signal flow between an electronic device performing parallel DNS signaling, a DNS server, and a content server according to various exemplary embodiments of the present disclosure; 
         FIG. 6  illustrates an example of operation flow of an electronic device that controls information on a domain name for parallel DNS signaling according to various exemplary embodiments of the present disclosure; 
         FIG. 7A  illustrates an example of operation flow of an electronic device that stores information on a domain name by time interval for parallel DNS signaling according to various exemplary embodiments of the present disclosure; 
         FIG. 7B  illustrates an example of signal flow between an electronic device adaptively performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure; 
         FIG. 8  illustrates another example of operation flow of an electronic device that controls information on a domain name stored for parallel DNS signaling according to various exemplary embodiments of the present disclosure; 
         FIG. 9A  illustrates an example of operation flow of an electronic device that stores information on a domain name by user for parallel DNS signaling according to various exemplary embodiments of the present disclosure; 
         FIG. 9B  illustrates another example of signal flow between an electronic device adaptively performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure; 
         FIG. 10  illustrates another example of signal flow between an electronic device performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure; 
         FIG. 11A  illustrates another example of signal flow between an electronic device performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure; 
         FIG. 11B  illustrates an example of signal flow between an electronic device performing parallel DNS signaling, a proxy server, and a DNS server according to various exemplary embodiments of the present disclosure; 
         FIG. 12  illustrates an example of a functional configuration of an electronic device according to various exemplary embodiments of the present disclosure; 
         FIG. 13A  illustrates an example of a functional configuration included in a storage unit in an electronic device according to various exemplary embodiments of the present disclosure; and 
         FIG. 13B  illustrates another example of a functional configuration included in a storage unit in an electronic device according to various exemplary embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIGS. 1 through 13B , discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device. 
     Hereinafter, in various embodiments of the present disclosure, hardware approaches will be described as an example. However, various embodiments of the present disclosure include a technology that uses both hardware and software and thus, the various embodiments of the present disclosure may not exclude the perspective of software. 
     The internet provides users with information through various types of servers. These servers may be distinguished from each other through an internet protocol (IP) address. However, an IP address is set as a combination of a plurality of numbers and thus may have low accessibility. To compensate for the low accessibility of the IP address, a method of accessing the Internet using a domain name is widely used. 
     Here, a domain name may have a unique address (for example, an IP address or the like) to indicate a specific host (or server) on the Internet. Further, the domain name may be set with a word having a meaning or with a combination of words. Since the domain name is set with a word having a meaning or with a combination of words, a user using the domain name may easily and intuitively access the Internet. 
     In addition, the domain name may be data (or a sequence) processed based on a domain name (or a host name) recognizable by a user for a domain name system (DNS) query. Depending on exemplary embodiments, the domain name may be set to be the same as or different from the domain name (or the host name) recognizable by the user. 
     However, the method of accessing the internet using the domain name may compensate for the low accessibility of an IP address but may utilize an additional procedure, such as a DNS query procedure. The DNS query procedure is an additional procedure and thus may cause a delay. This delay may reduce the speed of Internet access, thus decreasing user convenience. 
     Therefore, the present disclosure proposes a new DNS query procedure that is capable of reducing a delay. 
     The term “domain name” used in the present disclosure refers to a combination of characters corresponding to the IP address of a host or domain and is a concept including a domain name, a host name, a fully qualified domain name (FQDN), or the like. 
       FIG. 1  illustrates an example of a network structure for accessing the Internet according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 1 , a network  100  may include an electronic device  110 , a DNS server  120 , and a content server  130 . 
     The electronic device  110  may be a device that is portable. For example, the electronic device  110  may be a mobile phone, a smart phone, a music player, a portable game console, a navigation system, a laptop computer, or the like. When the electronic device  110  is a device that is portable, the electronic device  110  may also be referred to as a mobile station, a terminal, a station (STA), user equipment, or the like. 
     The electronic device  110  may be a fixed device. For example, the electronic device  110  may be a desktop computer, a video game console, a smart television (TV), a household electronic device with a communication function (for example, a refrigerator, a boiler, or the like), a mirror display, or the like. 
     The electronic device  110  may communicate with another electronic device or another entity. For example, the entity may be various types of servers (for example, the DNS server  120 , the content server  130 , or the like). In another example, the entity may be a base station that provides a cellular communication service. In another example, the entity may be an access point (AP) that provides a wireless local area network (WLAN) service. In some exemplary embodiments, the electronic device  110  may communicate with the other electronic device or entity through a wired communication path. In other exemplary embodiments, the electronic device  110  may communicate with the other electronic device or entity through a wireless communication path. The wireless communication path may be a wireless-fidelity (Wi-Fi) path. The wireless communication path may also be a cellular communication path. Further, the wireless communication path may be a path for proximity communication, such as bluetooth or bluetooth low energy (BLE). 
     The DNS server  120  may be a device that provides another entity (for example, the electronic device  110  or the like) with information on an address (for example, an IP address) corresponding to a domain name set with a combination of characters. Here, the address may have various formats. For example, the address may have an internet protocol version 4 (IPv4) format or an IPv6 format. Specifically, the DNS server  120  may receive a DNS query message from the electronic device  110 . The DNS query message may include information on the entity or part of a domain name. The DNS server  120  may transmit, to the electronic device  110 , a DNS response message including information on an address (for example, an IP address) corresponding to the information on the domain name included in the received DNS query message. 
     The DNS server  120  may be provided with information on an address corresponding to a domain name from the content server  130  in order to provide the information on the address corresponding to the queried domain name to the electronic device  110 . Further, the DNS server  120  may be further provided with information on an available period of the address provided from the content server  130 . The available period may be a parameter indicating the period during which the address is available. The available period may be a parameter indicating how long the DNS server  120  retains the address as cached information. For example, the information on the available period may include information on time-to-live (TTL). 
     Although  FIG. 1  shows the DNS server  120  as a single entity, which is for illustrative purposes only, the DNS server  120  illustrated in  FIG. 1  may be configured as an aggregation of a plurality of DNS servers. For example, the DNS server  120  may be configured as an aggregation of a plurality of local DNS servers and/or higher DNS servers (for example, root DNS servers, mirror servers, or the like). When the DNS server  120  is configured as an aggregation of a plurality of DNS servers, the DNS server  120  may determine information on an address corresponding to a domain name requested by another entity through information exchange between the plurality of DNS servers and may provide the information on the address to the other entity. 
     The content server  130  may be a server that provides various types of information to another entity (for example, the electronic device  110  or the like). For example, the content server  130  may be a server that provides a portal service. In another example, the content server  130  may be a server that provides an Internet shopping service. In another example, the content server  130  may be a server that provides a video streaming service or a sound streaming service. In yet another example, the content server  130  may be a server that provides a game service. In another example, the content server  130  may be a server that provides a social networking service (SNS). 
     Specifically, the content server  130  may receive a message for requesting data from the other entity. The content server  130  may transmit a message including data requested by the received message to the other entity. 
     The content server  130  may provide information on an address corresponding to a domain name to the DNS server  120  so that the DNS server  120  provides the information on the address corresponding to the queried domain name to the electronic device  110 . In addition, the content server  130  may further provide the DNS server  120  with information on an available period of the provided address. For example, the information on the available period may include TTL information. 
     A procedure for accessing the Internet using a domain name may be performed as follows. The electronic device  110  may detect a uniform resource locator (URL), “m.navee.com,” which a user directly inputs into a web page, as in a user interface (UI)  112 , or may detect a URL that is automatically accessed when a user runs an application, as in a UI  114 . The electronic device  110  may identify a domain name (for example, “m.navee.com” in the UI  112 ) in the detected URL. 
     The electronic device  110  may transmit a DNS query message including information on the identified domain name to the DNS server  120 . The DNS server  120  may receive the DNS query message including the information on the identified domain name from the electronic device  110 . The DNS server  120  may identify an address corresponding to the identified domain name. The DNS server  120  may transmit a DNS response message including information on the identified address to the electronic device  110 . The DNS response message may further include information on an available period of the identified address. The electronic device  110  may receive the DNS response message including the information on the identified address from the DNS server  120 . Here, a process in which the electronic device  110  transmits the DNS query message to the DNS server and a process in which the electronic device  110  receives the DNS response message from the DNS server may collectively be referred to as DNS signaling. 
     The electronic device  110  may acquire information for identifying a server that the electronic device  110  desires to access through the received DNS response message. For example, the electronic device  110  may acquire information on an IP address of the content server  130  through the received DNS response message. The electronic device  110  may transmit a message for requesting data to the content server  130  using the acquired IP address. That is, the electronic device  110  may transmit a message for requesting data to the content server  130  indicated by the acquired address. The data may include information on a service to be provided from the content server  130 . The content server  130  may receive the message for requesting the data from the electronic device  110 . 
     The content server  130  may transmit a message (that is, a data response message) including the data requested by the electronic device  110  to the electronic device  110 . The electronic device  110  may receive the data response message from the content server  130 . 
       FIG. 2  illustrates an example of signal flow between an electronic device accessing the Internet using a domain name, a DNS server, and a content server according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 2 , the electronic device  110  may detect a domain name in operation S 210 . The detection of the domain name may be caused by input into a web page displayed on the electronic device  110 , such as a UI  205 . The electronic device  110  may detect the domain name within a URL identified by the input. 
     In operation S 220 , the electronic device  110  may determine whether an address corresponding to the detected domain name is stored in the electronic device  110 . When the electronic device  110  has previously accessed a server indicated by the domain name, the electronic device  110  may store the address during an available period (for example, TTL or the like) of the address. When the address is stored, the electronic device  110  already recognizes information on an address of the server indicated by the domain name, and thus does not need to perform DNS signaling. That is, when the address corresponding to the detected domain name is stored in the electronic device  110 , the electronic device  110  may perform operation S 250 , without needing to perform operation S 230  and operation S 240 . However, when the address is not stored in the electronic device  110 , the electronic device  110  needs to perform DNS signaling in order to acquire the information on the address of the server indicated by the domain name. That is, when the address corresponding to the detected domain name is not stored in the electronic device  110 , the electronic device  110  may perform an operation in operation S 230 . 
     In operation S 230 , the electronic device  110  may transmit a DNS query message including information on the detected domain name to the DNS server  120 . The electronic device  110  may transmit the DNS query message to the DNS server  120  in order to acquire the address of the server indicated by the domain name. The DNS server  120  may receive the DNS query message from the electronic device  110 . 
     In operation S 240 , the DNS server  120  may transmit a DNS response message including the information on the address corresponding to the domain name in response to the received DNS query message. In some exemplary embodiments, the DNS response message may further include information on the available period (for example, TTL) of the address. 
     The DNS query message and the DNS response message may each be set with a format  215 . For example, the DNS query message and the DNS response message may each include a header section, a question section, an answer section, an authority section, and an additional information section. 
     The header section may include an ID field for identifying whether a question and an answer correspond to each other, flag fields for defining a property of a query, a QDCount field for indicating the number of question sections, an ANCount field for indicating the number of answer sections, an NSCount field for indicating the number of authority sections, and/or an ARCount field for indicating the number of additional information sections. For example, the header section may have a 12-byte size. 
     The question section may include a name field including information on the detected domain name, a type field for indicating a question type, and/or a class field for indicating the class type of a network. The question section may have a variable length. 
     The answer section may include the name field, the type field, the class field, a TTL field for indicating how long the information on the address is retained as cached information in the DNS server  120 , an RDlength field for indicating the length of Rdata, and/or an Rdata field including the information on the address. 
     The authority section and the additional information section may have the same structure as the answer section. The authority section may be used when the DNS server  120  directly provides a response to a queried domain name, and the additional information section may be used when a response to a queried domain name is provided from another DNS server. 
     In operation S 250 , the electronic device  110  may transmit a data request message to the content server  130 . The electronic device  110  may identify the address of the content server  130  using the information on the address included in the received DNS response message. The electronic device  110  may transmit a message for requesting data to the content server  130  using the identified address. The content server  130  may receive the message for requesting the data from the electronic device  110 . 
     In operation S 260 , the content server  130  may transmit a data response message to the electronic device  110 . The content server  130  may transmit a message including information on data to the electronic device  110  in order to provide the electronic device  110  with a service requested by the electronic device  110 . The electronic device  110  may receive the message including the information on the data from the content server  130 . 
     In operation S 270 , the electronic device  110  may display the received data on a UI  210 . The UI  210  may be a UI displaying a response to the input on the web page in operation S 210 . Although operation S 270  shows a process in which the electronic device  110  displays the received data, the electronic device  110  may perform an operation of storing the data, an operation of reprocessing the data, and an operation of processing the data, instead of operation S 270 , depending on the embodiment. 
       FIG. 3  illustrates an example of DNS signaling according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 3 , the electronic device  110  may display a UI including a plurality of objects (for example, icons or the like), such as a UI  305 , at time  318 . Each of the plurality of objects may be used to run an application stored in the electronic device  110 . Some of the plurality of objects may be interrelated with an application using Internet access. For example, the application utilizing Internet may be an application for access to a web page, an application for an Internet shopping service, an application related to a game, or the like. 
     At time  320 , the electronic device  110  may detect a first input (input #1). For example, the first input may be an input with respect to an object related to an application for providing a portal service requiring Internet access. The electronic device  110  may identify a first domain name from the first input. 
     At time  322 , the electronic device  110  may transmit a first DNS query message (DNS query message #1) including information on the identified first domain name to the DNS server  120  in order to properly run the application for providing the portal service. The DNS server  120  may transmit a first DNS response message (DNS response message #1) including information on an address corresponding to the identified first domain name to the electronic device  110  in response to the reception of the first DNS query message including the information on the identified first domain name from the electronic device  110 . 
     At time  324 , the electronic device  110  may receive the first DNS response message including the information on the address corresponding to the identified first domain name from the DNS server  120 . 
     A time interval between the time  320  and the time  324  may be a. 
     At time  326 , the electronic device  110  may transmit a first data request message (data request message #1) to the server (for example, the content server  130  or the like) indicated by the received address. The electronic device  110  may transmit the first data request message to the server in order to properly run the application for providing the portal service. The server may transmit a first data response message (data response message #1) to the electronic device  110  in order to properly run the application for providing the portal service, in response to the reception of the first data request message from the electronic device  110 . 
     At time  328 , the electronic device  110  may receive the first data response message from the server. The first data response message may include information for properly running the application for providing the portal service. Further, the first data response message may include information requested from the electronic device  110  to the server using the first data request message. 
     At time  330 , the electronic device  110  may display a UI pertaining to the application for providing the portal service, such as a UI  310 , based on the received first data response message. 
     At time  332 , the electronic device  110  may detect a second input (input #2). For example, the second input may be an input with respect to an object included in the displayed UI  310 . The second input may be an input requiring access to a server having a different address. Further, the second input may be an input highly likely to occur after the first input. For example, the second input may be an input related to a function generally run by the user on the application run through the first input. The electronic device  110  may identify a second domain name from the second input. 
     At time  334 , the electronic device  110  may transmit a second DNS query message (DNS query message #2), including information on the identified second domain name, to the DNS server  120  in order to activate the function related to the second input. The DNS server  120  may transmit a second DNS response message (DNS response message #2), including information on an address corresponding to the identified second domain name, to the electronic device  110  in response to the reception of the second DNS query message including the information on the identified second domain name from the electronic device  110 . 
     At time  336 , the electronic device  110  may receive the second DNS response message including the information on the address corresponding to the identified second domain name from the DNS server  120 . 
     A time interval between the time  334  and the time  336  may be b. 
     At time  338 , the electronic device  110  may transmit a second data request message (data request message #2) to a server (for example, the content server  130  or the like) indicated by the received address. The electronic device  110  may transmit the second data request message to the server in order to perform the function related to the second input. The server may transmit a second data response message (data response message #2) to the electronic device  110  so that the electronic device  110  properly performs the function related to the second input, in response to the reception of the second data request message from the electronic device  110 . 
     At time  340 , the electronic device  110  may receive the second data response message from the server. The second data response message may include information for properly activating the function related to the second input. Further, the second data response message may include information requested from the electronic device  110  to the server using the second data request message. 
     At time  342 , the electronic device  110  may display a UI related to the second input, such as a UI  315 , based on the received second data response message. 
     As described above, the user of the electronic device  110  may access the Internet using a domain name, which has higher accessibility than an address set with a combination of numbers. However, Internet access using a domain name additionally utilizes DNS signaling between the electronic device  110  and the DNS server  120 . DNS signaling is used whenever access to a new entity occurs, which may cause a delay. In  FIG. 3 , Internet access by the electronic device  110  may be delayed by a+b in a time period between the time  318  and the time  342 . 
     Therefore, the present disclosure provides an electronic device and an operating method thereof that perform, in parallel, not only a DNS query about a content server to which access is currently being attempted, but also a DNS query expected to occur after the DNS query to thereby reduce a delay caused by DNS signaling. 
       FIG. 4  illustrates an example of parallel DNS signaling according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 4 , an electronic device  110  may display a UI including a plurality of objects, such as a UI  405 , at time  418 . 
     At time  420 , the electronic device  110  may detect a first input (input #1). For example, the first input may be an input made with respect to an object related to an application for providing a portal service requiring Internet access. The electronic device  110  may analyze the first input, thereby identifying a first domain name from the first input. 
     At time  422 , the electronic device  110  may transmit not only a first DNS query message (DNS query message #1) including information on the identified first domain name but also a second DNS query message (DNS query message #2) including information on a second domain name to the DNS server  120  in order to reduce a delay caused by DNS signaling. The second domain name may be a domain name associated with the first domain name. 
     For example, suppose that the user of the electronic device  110  has a high probability of accessing a server indicated by the second domain name within a designated interval after accessing a server indicated by the first domain name. In this case, the electronic device  110  may predict, by learning an Internet access pattern of the user of the electronic device  110 , that the user of the electronic device  110  accesses the server indicated by the first domain name and then accesses the server indicated by the second domain name. Therefore, the electronic device  110  may transmit, to the DNS server  120 , not only the first DNS query message including the information on the first domain name that the user of the electronic device  110  currently accesses but also the second DNS query message including the information on the second domain name associated with the first domain name. 
       FIG. 4  illustrates an example in which the first DNS query message and the second DNS query message are simultaneously transmitted. In some exemplary embodiments, however, the first DNS query message and the second DNS query message may be transmitted at a certain time interval without regard as to the order thereof. Also, in some other exemplary embodiments, the electronic device  110  may transmit a single DNS query message including the information on the first domain name and the information on the second domain name associated with the first domain name to the DNS server  120 . 
     The DNS server  120  may receive the first DNS query message from the electronic device  110  and may receive the second DNS query message from the electronic device  110 . To notify the electronic device  110  of an address corresponding to the first domain name, the DNS server  120  may transmit a first DNS response message (DNS response message #1), including information on the address corresponding to the first domain name, to the electronic device  110 . Further, to notify the electronic device  110  of an address corresponding to the second domain name, the DNS server  120  may transmit a second DNS response message (DNS response message #2), including information on the address corresponding to the second domain name, to the electronic device  110 . 
     At time  424 , the electronic device  110  may receive the first DNS response message including the information on the address corresponding to the first domain name from the DNS server  120 . 
     At time  426 , the electronic device  110  may receive the second DNS response message including the information on the address corresponding to the second domain name from the DNS server  120 . The electronic device  110  may store the information on the address corresponding to the second domain name included in the received second DNS response message. In some exemplary embodiments, when the received second DNS response message further includes an available period (for example, TTL or the like) of the address corresponding to the second domain name, the information on the address corresponding to the second domain name may be stored in the electronic device  110  during the available period. 
     A time of “a,” corresponding to a time interval between the time  422  and the time  424 , may be consumed for signaling for a query and a response associated with the first domain name, and a time of “b,” corresponding to a time interval between the time  422  and the time  426 , may be consumed for signaling for a query and a response associated with the second domain name. 
       FIG. 4  illustrates a case where the time interval b is longer than the time interval a, which is merely an example for description. The time interval b may be equal to the time interval a, or may be shorter than the time interval a. 
     Processes of transmitting the first DNS query message, transmitting the second DNS query message, receiving the first DNS response message, and receiving the second DNS response message may collectively be referred to as parallel DNS signaling. 
     At time  428 , the electronic device  110  may transmit a first data request message (data request message #1) to a server indicated by the first DNS response message. The server indicated by the first DNS response message may transmit a first data response message (data response message #1) to the electronic device  110  in response to the reception of the first data request message from the electronic device  110 . The first data response message may include information requested by the electronic device  110 . 
       FIG. 4  illustrates the case where the time  428  follows the time  426 , which is merely an example for description. The time  428  may be coincident with or may precede the time  426 . That is, the electronic device  110  may transmit the first data request message to the server indicated by the first DNS response message, regardless of whether the second DNS response message is received. 
     At time  430 , the electronic device  110  may receive the first data response message from the server indicated by the first DNS response message. 
     At time  432 , the electronic device  110  may display a UI, such as a UI  410 , based on the received first data response message. 
     At time  434 , the electronic device  110  may detect a second input (input #2). The second input may be an input for the electronic device  110  to access the server indicated by the second domain name. 
     In some exemplary embodiments, the second input may be an input predicted to be detected within a designated interval after the electronic device  110  detects the first input. The designated interval may be a period determined by the electronic device  110 . As described above, the electronic device  110  may predict that the second input is detected after the first input is detected, by learning that the user of the electronic device  110  has a high probability of accessing the server indicated by the second domain name after accessing the server indicated by the first domain name. The electronic device  110  may use the designated interval in order to check whether the second input actually occurs (or is detected) after the first input is detected. For example, when the electronic device  110  learns that the user of the electronic device  110  accesses the server indicated by the first domain name and then accesses the server indicated by the second domain name after k seconds, the electronic device  110  may set the designated interval to k seconds. Depending on the embodiment, the electronic device  110  may set the designated interval to k+1 seconds to provide additional time for the second input. 
     At time  436 , the electronic device  110  may transmit a second data request message (data request message #2) to the server indicated by the address corresponding to the second domain name, without DNS signaling. Since the electronic device  110  stores the address corresponding to the second domain name in advance based on the second DNS response message received at the time  426 , the electronic device  110  may transmit the second data request message to the server indicated by the address corresponding to the second domain name, without DNS signaling. The server indicated by the address corresponding to the second domain name may transmit a second data response message to the electronic device  110  in response to the reception of the second data request message from the electronic device  110 . 
     At time  438 , the electronic device  110  may receive the second data response message from the server indicated by the address corresponding to the second domain name. 
     At time  440 , the electronic device  110  may display a UI related to the second input, such as a UI  415 , based on the received second data response message. 
     The electronic device  110  of  FIG. 3  has a delay due to DNS signaling, which is a time interval of a+b, to perform the procedure shown in  FIG. 3 , while the electronic device  110  of  FIG. 4  has a delay due to DNS signaling, which is a time interval of, to perform the same procedure as that in  FIG. 3  (that is, the procedure shown in  FIG. 4 ). That is, the electronic device  110  shown in  FIG. 4 , which performs parallel DNS signaling, may access the Internet with a shorter delay than the electronic device  110  shown in  FIG. 3 , which performs general DNS signaling.  FIG. 4  illustrates the case where there is one domain name associated with the first domain name. However, when there is a plurality of domain names associated with the first domain name, the delay reduction effect may be further enhanced. 
     That is, an electronic device and an operating method thereof according to various exemplary embodiments of the present disclosure may reduce a delay due to DNS signaling through parallel DNS signaling, thereby allowing a user to quickly access the Internet. In addition, an electronic device and an operating method thereof according to various exemplary embodiments of the present disclosure may reduce a delay caused by DNS signaling through parallel DNS signaling, thereby allowing a user to quickly run an application. 
       FIG. 5  illustrates an example of signal flow between an electronic device performing parallel DNS signaling, a DNS server, and a content server according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 5 , the electronic device  110  may detect a first input with respect to a first domain name in operation S 510 . For example, the electronic device  110  may identify the first domain name from a URL directly input into a web page, a URL included as an attribute of an object (for example, a link or the like) displayed on a web page, or a URL included as an attribute of an object for running an application requiring Internet access. 
     In operation S 520 , the electronic device  110  may detect an input with respect to a second domain name within a designated interval after detecting the first input. 
     Operation S 510  and operation S 520  may be repeatedly performed. For example, when the user of the electronic device  110  habitually generates the first input and then generates a second input within the designated interval, operation S 510  and operation S 520  may be repeatedly performed. Further, the electronic device  110  may learn that the second input is predicted to be detected within the designated interval after the first input is detected, through the repetition of operation S 510  and operation S 520 . 
     When the electronic device  110  learns that the second input is detected within the designated interval after the first input is detected, the electronic device  110  may store the second domain name as a domain name associated with the first domain name in the electronic device  110 , in response to the detection of the second input, in operation S 530 . Operation S 530  may be an operation to perform a DNS query about the second domain name in parallel when the first input is subsequently detected and thus a DNS query about the first domain name is performed. 
     In operation S 540 , the electronic device  110  may detect a third input with respect to the first domain name. 
     In operation S 550 , the electronic device  110  may transmit a DNS query message including information on the first domain name to the DNS server  120  in order to obtain an address of a server indicated by the first domain name. For example, the address may be an IP address. Further, the electronic device  110  may predict that input with respect to the second domain name may be detected after the input with respect to the first domain name, and thus may transmit a DNS query message including information on the second domain name to the DNS server  120 . The DNS server  120  may receive the DNS query message including the information on the first domain name and the DNS query message including the information on the second domain name from the electronic device  110 . 
     In operation S 560 , the DNS server  120  may transmit a DNS response message including information on a first address corresponding to the first domain name and a DNS response message including information on a second address corresponding to the second domain name to the electronic device  110 . The DNS response message including the information on the first address may be a message for reporting an address of a server that the electronic device  110  intends to access through the third input. The DNS response message including the information on the second address may be a message for storing in advance the information on the second address corresponding to the second domain name in the electronic device  110  in order to prepare for the access of the electronic device  110  to the server indicated by the second domain name. The operation of storing the address in advance may also be referred to as pre-caching, pre-fetching, or pre-resolving depending on the embodiment. 
     In some exemplary embodiments, the DNS response message including the information on the first address may further include information on an available period (for example, TTL or the like) of the first address, and the DNS response message including the information on the second address may further include information on an available period of the second address. 
     In operation S 570 , the electronic device  110  may store the information on the first address and the information on the second address in the electronic device  110  (for example, a storage unit in the electronic device  110 ). In some exemplary embodiments, when the DNS response message including the information on the first address further includes the information on the available period (for example, TTL or the like) of the first address and the DNS response message including the information on the second address further includes the information on the available period of the second address, the information on the first address may be stored in a first electronic device  110  during the available period of the first address and the information on the second address may be stored in a second electronic device  110  during the available period of the second address. 
     In operation S 580 , the electronic device  110  may transmit a data request message to a first content server  130 - 1  to perform an operation with respect to the third input. The first content server  130 - 1  may be a server performing a function the same as or similar to that of the content server  130  shown in  FIG. 1  and/or  FIG. 2 . The first content server  130 - 1  may be a server providing the electronic device  110  with a function or a service corresponding to the third input. The first content server  130 - 1  may receive the data request message from the electronic device  110 . 
     In operation S 585 , the first content server  130 - 1  may transmit a data response message, generated based on the data request message, to the electronic device  110 . The electronic device  110  may receive the data response message from the first content server  130 - 1 . 
     In operation S 590 , the electronic device  110  may detect a fourth input with respect to the second domain name. The fourth input may be an input detected within the designated interval after the third input is detected. The fourth input may be an input associated with the third input. The fourth input may be an input predicted to be detected by the electronic device  110  within the designated interval after the third input is detected. 
     In operation S 592 , the electronic device  110  may identify an address of a second content server  130 - 2  based on the stored second address. The second content server  130 - 2  may be a server performing a function the same as or similar to that of the content server  130  shown in  FIG. 1  and/or  FIG. 2 . The second content server  130 - 2  may be a server providing the electronic device  110  with a function or a service corresponding to the fourth input. The electronic device  110  may store information on the address of the second content server  130 - 2  in advance through operation S 570 . The electronic device  110  may identify the address of the second content server  130 - 2 , without a DNS query operation, based on the stored information on the address of the second content server  130 - 2 . 
     In operation S 594 , the electronic device  110  may transmit a data request message to the second content server  130 - 2  based on the identified address of the second content server  130 - 2 . The electronic device  110  may transmit the data request message to the second content server  130 - 2  in order to be provided with the function or service corresponding to the fourth input from the second content server  130 - 2 . The second content server  130 - 2  may receive the data request message from the electronic device  110 . 
     In operation S 596 , the second content server  130 - 2  may transmit a data response message to the electronic device  110 . The second content server  130 - 2  may transmit the data response message to the electronic device  110  in response to the data request message in order to provide the electronic device  110  with the function or service corresponding to the fourth input. The electronic device  110  may receive the data response message from the second content server  130 - 2 . 
     As described above, the electronic device  110  according to various exemplary embodiments of the present disclosure may prevent a decrease in Internet access speed due to DNS signaling through a learning operation, such as operation S 510  and operation S 520 , a pre-caching operation, such as operation S 530 , and a parallel DNS signaling operation, such as operation S 550  and operation S 560 . 
       FIG. 6  illustrates an example of operation flow of an electronic device that controls information on a domain name for parallel DNS signaling according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 6 , the electronic device  110  may detect a first input with respect to a first domain name in operation S 610 . 
     In operation S 620 , the electronic device  110  may detect a second input with respect to a second domain name within a designated interval after detecting the first input. When the second input is detected within the designated interval following the first input, the electronic device  110  may perform an operation for determining the second input as an input that occurs following the first input. 
     In operation S 630 , the electronic device  110  may determine whether the second domain name is stored as a domain name associated with the first domain name in order to determine whether the second input is an input that occurs after the first input. When no second domain name is stored as a domain name associated with the first input, the electronic device  110  may perform operation S 640 . However, when the second domain name is stored as a domain name associated with the first input, the electronic device  110  may perform operation S 650 . 
     In operation S 640 , the electronic device  110  may store the second domain name as a domain name associated with the first domain name. The electronic device  110  may store the second domain name as a domain name associated with the first domain name in order to determine whether the second input is an input that occurs after the first input. In some exemplary embodiments, the electronic device  110  may store the second domain name as a domain name associated with the first domain name in order to monitor whether the second input is an input that occurs after the first input. 
     In operation S 650 , the electronic device  110  may update information on the second domain name. The electronic device  110  may update the information on the second domain name stored as the domain name associated with the first domain name in order to predict an input that occurs after the first input. For example, suppose that the second domain name and a third domain name are stored in the electronic device  110  as a domain name associated with the first domain name. When the frequency at which the second input is detected after the first input is detected is greater than the frequency at which a third input with respect to the third domain name is detected after the first input is detected, the electronic device  110  may update the information on the second domain name so that the second domain name is set to have a higher priority than the third domain name. For example, the electronic device  110  may control information on the second domain name and the third domain name using the following matrix, shown in Equation 1. 
     
       
         
           
             
               
                 
                   G 
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                             11 
                           
                         
                         
                           
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                             p 
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                             p 
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                             p 
                             
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                   [ 
                   
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     Here, p ij  denotes the probability that input j is detected within a designated interval after input i is detected. 
     For example, p 12  denotes the probability that the second input is detected within the designated interval after the first input is detected, and p 13  denotes the probability that the third input is detected within the designated interval after the first input is detected. 
     The electronic device  110  may determine priorities of the second input and the third input associated with the first input corresponding to probability values represented by elements in the matrix in Equation 1. 
     When the second domain name is stored as the domain name associated with the first domain name, as in operation S 650 , the electronic device  110  may adjust p 12  upwards in the matrix in Equation 1. 
     However, when the second domain name is not stored as a domain name associated with the first domain name, as in operation S 640 , the electronic device  110  may insert p 12  into the matrix in Equation 1 in order to monitor whether the second input is subsequently detected within the designated interval after the first input is detected. In this case, p 12  may be set to 1/(number of times the first input is detected). 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may predict an input that occurs after an input detected by the electronic device  110  through operations S 610  through S 650 . That is, the electronic device  110  may control information on a relationship between a domain name and another domain name for parallel DNS signaling through operations S 610  to S 650 . 
       FIG. 7A  illustrates an example of operation flow of an electronic device that stores information on a domain name by time interval for parallel DNS signaling according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 7A , the electronic device  110  may detect a first input with respect to a first domain name in operation S 710 . 
     In operation S 712 , the electronic device  110  may detect a second input with respect to a second domain name within a designated interval after detecting the first input. In general, users may use an electronic device for different purposes in different time intervals. That is, users may activate a different function of the electronic device in different time intervals. For example, the user of the electronic device  110  may access a portal site through the first input and may access a weather site connected to the portal site through the second input in the morning, while the user may access a portal site through the first input and may access a news site connected to the portal site through the second input in the evening. In another example, the user of the electronic device  110  may access a portal site through the first input and may access a shopping site through the second input on weekdays (from Monday to Friday), while the user may access a portal site through the first input and may access a travel site through the second input at weekends. Accordingly, the electronic device  110  may perform an operation for distinguishing the usage patterns of the user of the electronic device  110  in different time intervals. 
     In operation S 714 , the electronic device  110  may determine whether the second input is detected in a first time interval in order to learn the usage pattern of the user of the electronic device  110  by time interval. When the second input is detected in the first time interval, the electronic device  110  may perform operation S 716 . However, when the second input is not detected in the first time interval, the electronic device  110  may perform operation S 718 . 
     In operation S 716 , the electronic device  110  may store the second domain name as a domain name associated with the first domain name in a region for the first time interval. Operation S 716  of  FIG. 7A  illustrates a process of storing the second domain name as the domain name associated with the first domain name. However, when the second domain name is already stored as a domain name associated with the first domain name in the region for the first time interval, the electronic device  110  may update information on the second domain name stored in the region for the first time interval, as in operation S 650  of  FIG. 6 . 
     In operation S 718 , the electronic device  110  may determine whether the second input is detected in a second time interval. When the second input is detected in the second time interval, the electronic device  110  may perform operation S 720 . However, when the second input is not detected in the second time interval, the electronic device  110  may perform operation S 722 . 
     In operation S 720 , the electronic device  110  may store the second domain name as a domain name associated with the first domain name in a region for the second time interval. Operation S 720  of  FIG. 7A  illustrates a process of storing the second domain name as the domain name associated with the first domain name. However, when the second domain name is already stored as a domain name associated with the first domain name in the region for the second time interval, the electronic device  110  may update the information on the second domain name stored in the region for the second time interval, as in operation S 650  of  FIG. 6 . 
     In operation S 722 , the electronic device  110  may store the second domain name as a domain name associated with the first domain name in a region for a third time interval. 
       FIG. 7A  illustrates three divided time intervals, which is merely for description. In alternative embodiments, there may be n divided time intervals depending on the configuration set by the user of the electronic device  110  or a result of learning by the electronic device  110 . 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may predict an input that occurs after a detected input, categorized according to time, through operations S 710  to S 722 . That is, the electronic device  110  may adaptively perform parallel DNS signaling according to the usage pattern of the electronic device  110  through operations S 710  to S 722 , thereby improving the Internet access speed of the electronic device  110 . 
       FIG. 7B  illustrates an example of signal flow between an electronic device adaptively performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 7B , the electronic device  110  may detect a first input with respect to a first domain name in operation S 730 . The electronic device  110  may predict an input that occurs after the first input according to time. That is, the electronic device  110  may predict an input that occurs after the first input according to time through the operations illustrated in  FIG. 7A . 
     In operation S 735 , the electronic device  110  may identify the time at which the first input is detected in order to predict an input that occurs after the first input according to time. For example, when the first input is detected at 9 a.m., the electronic device  110  may identify that the first input is detected at 9 a.m. In another example, when the first input is detected at 4 p.m., the electronic device  110  may identify that the first input is detected at 4 p.m. 
     In operation S 740 , the electronic device  110  may identify a domain name in a region corresponding to the identified time among domain names associated with the first domain name. For example, when the identified time is 9 a.m., the electronic device  110  may identify, as a domain name associated with the first domain name, a domain name in a storage region for morning time among the domain names associated with the first domain name. In another example, when the identified time is 4 p.m., the electronic device  110  may identify, as a domain name associated with the first domain name, a domain name in a storage region for an evening time among the domain names associated with the first domain name. 
     In operation S 745 , the electronic device  110  may transmit a DNS query message including information on the first domain name and may transmit a DNS query message including information on the identified domain name in order to initialize parallel DNS signaling. In some exemplary embodiments, the DNS query message including the information on the first domain name and the DNS query message including the information on the identified domain name may be transmitted at the same time or at a certain interval regardless of order. In some other exemplary embodiments, unlike in  FIG. 7B , the information on the first domain name and the information on the identified domain name may be transmitted via a single DNS query message. 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may determine (or identify) a domain name associated with a domain name with respect to an input adaptively detected by time interval to perform a DNS query through operations S 730  to S 745 . That is, the electronic device  110  may perform parallel DNS signaling by reflecting the usage pattern of the electronic device  110  of the user, which changes by time interval, through the operation in operations S 730  to S 745 . 
       FIG. 8  illustrates another example of operation flow of an electronic device that controls information on a domain name stored for parallel DNS signaling according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 8 , in operation S 810 , the electronic device  110  may identify (or determine) whether a second domain name, stored as a domain name associated with a first domain name, has been used during a predetermined period. For example, when a pattern, in which a second input with respect to the second domain name is detected within a designated interval after a first input with respect to the first domain name is detected, is changed to a pattern, in which the second input is not detected after the first input is detected, due to a user&#39;s pattern change, the electronic device  110  may need to discard or delete the second domain name stored as the domain name associated with the first domain name. The electronic device  110  may set the predetermined period to perform this discarding or deleting operation. The predetermined period may be a parameter for identifying the availability of the second domain name stored as the domain name associated with the first domain name. The predetermined period may be a parameter for discarding a relationship between the second domain name and the first domain name when the second domain name is not associated with the first domain name due to the user&#39;s pattern change. 
     The electronic device  110  may identify whether the second domain name stored as the domain name associated with the first domain name has been used during the predetermined period in order to identify the availability of the second domain name stored as the domain name associated with the first domain name. When the second domain name has been used during the predetermined period, the electronic device  110  may perform operation S 830 . However, when the second domain name has not been used during the predetermined period, the electronic device  110  may perform operation S 820 . 
     In operation S 820 , the electronic device  110  may discard or delete the second domain name stored as the domain name associated with the first domain name. The electronic device  110  may discard the second domain name stored as the domain name associated with the first domain name by recognizing a change of the usage pattern of the user of the electronic device  110 . 
     In operation S 830 , the electronic device  110  may continue to store the second domain name as the domain name associated with the first domain name. 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may accurately determine a domain name associated with a domain name detected by an input through operations S 810  through S 830 . Further, through the operation in operations S 810  to S 830 , the electronic device  110  may filter a domain name not associated with the detected domain name, thereby efficiently controlling a storage unit in the electronic device  110 . 
       FIG. 9A  illustrates an example of operation flow of an electronic device that stores information on a domain name by user for parallel DNS signaling according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 9A , the electronic device  110  may detect a first input with respect to a first domain name in operation S 910 . 
     In operation S 912 , the electronic device  110  may detect a second input with respect to a second domain name within a designated interval after the first input is detected. The electronic device  110  may be used by a single user or by a plurality of users. The plurality of users may use the electronic device  110  for different purposes. For example, if a user of the electronic device  110  is an adult, the user may use the electronic device  110  in a pattern of making a first input for accessing a portal site and then making a second input for accessing a news site. Alternatively, when another user of the electronic device  110  is a child, the user may use the electronic device  110  in a pattern of making a first input for accessing a portal site and then making a second input for accessing a game site. Accordingly, the electronic device  110  may perform an operation for distinguishing a domain name associated with an inputted domain name for each user. 
     In operation S 914 , the electronic device  110  may identify whether the first input and the second input are made by a first user in order to learn the usage pattern of each user of the electronic device  110 . For example, the electronic device  110  may identify whether the first input and the second input are made by the first user through a user&#39;s ID, a user&#39;s fingerprint, or a user&#39;s password received by the electronic device  110 . When the first input and the second input are made by the first user, the electronic device  110  may perform operation S 916 . When the first input and the second input are not made by the first user, the electronic device  110  may perform operation S 918 . 
     In operation S 916 , the electronic device  110  may store the second domain name as a domain name associated with the first domain name in a region for the first user. Operation S 916  of  FIG. 9A  illustrates a process of storing the second domain name as a domain name associated with the first domain name. However, when the second domain name is already stored as a domain name associated with the first domain name in the region for the first user, the electronic device  110  may update information on the second domain name stored in the region for the first user, as in operation S 650  of  FIG. 6 . 
     In operation S 918 , the electronic device  110  may identify whether the first input and the second input are made by a second user. When the first input and the second input are made by the second user, the electronic device  110  may perform operation S 920 . When the first input and the second input are not made by the second user, the electronic device  110  may perform operation S 922 . 
     In operation S 920 , the electronic device  110  may store the second domain name as a domain name associated with the first domain name in a region for the second user. Operation S 920  of  FIG. 9A  illustrates a process of storing the second domain name as a domain name associated with the first domain name. However, when the second domain name is already stored as a domain name associated with the first domain name in the region for the second user, the electronic device  110  may update information on the second domain name stored in the region for the second user, as in operation S 650  of  FIG. 6 . 
     In operation S 922 , the electronic device  110  may store the second domain name as a domain name associated with the first domain name in a region for a third user. 
       FIG. 9A  illustrates a case where there are three users of the electronic device, which is merely for description. The number of users of the electronic device  110  may be two or more than three. 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may store an input that occurs after a detected input separately for each user through operations S 910  to S 922 . That is, through operations S 910  to S 922 , the electronic device  110  may perform parallel DNS signaling adaptively for each user of the electronic device  110 , thereby improving the Internet access speed of the electronic device  110 . 
       FIG. 9B  illustrates another example of signal flow between an electronic device adaptively performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 9B , the electronic device  110  may detect a first input made with respect to a first domain name in operation S 930 . The electronic device  110  may predict an input that occurs after the first input, which varies by user. That is, the electronic device  110  may predict an input that occurs after the first input, which varies by user, through the operations illustrated in  FIG. 9A . 
     In operation  935 , the electronic device  110  may identify which user made the first input. For example, the electronic device  110  may identify which user made the first input based on a user&#39;s ID, a user&#39;s fingerprint, a user&#39;s iris pattern, or a user&#39;s password. 
     In operation  940 , the electronic device  110  may identify a domain name associated with the first domain name within a region for the identified user. For example, when the identified user is A, the electronic device  110  may identify the domain name associated with the first domain name in a storage region for user A in order to reflect the usage pattern of user A. In another example, when the identified user is B, the electronic device  110  may identify the domain name associated with the first domain name in a storage region for user B in order to reflect the usage pattern of user B. 
     In operation S 945 , the electronic device  110  may transmit a DNS query message including information on the first domain name and may transmit a DNS query message including information on the identified domain name in order to initiate parallel DNS signaling. In some exemplary embodiments, the DNS query message including the information on the first domain name and the DNS query message including the information on the identified domain name may be transmitted at the same time or at a certain interval regardless of order. In some other exemplary embodiments, unlike in  FIG. 9B , the information on the first domain name and the information on the identified domain name may be transmitted via a single DNS query message. 
     Through operations S 930  to S 945 , the electronic device  110  according to various exemplary embodiments of the present disclosure may identify a domain name associated with another domain name with respect to an input adaptively detected by user, thereby performing parallel DNS signaling. That is, through operations S 930  to S 945 , the electronic device  110  may perform parallel DNS signaling considering a usage pattern, which may be different for respective users. 
       FIG. 10  illustrates another example of signal flow between an electronic device performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 10 , the electronic device  110  may transmit a DNS query message including information on a first domain name in operation S 1010 . The first domain name may be a domain name identified by an input made by a user. The DNS server  120  may receive the DNS query message including the information on the first domain name from the electronic device  110 . 
     In operation S 1015 , the electronic device  110  may transmit a DNS query message including information on a second domain name. The second domain name may be a domain name associated with the first domain name. The DNS server  120  may receive the DNS query message including the information on the second domain name from the electronic device  110 . 
     Operation S 1010  and operation S 1015  may be performed simultaneously or in reverse order depending on the embodiment. 
     In operation S 1020 , the DNS server  120  may transmit, to the electronic device  110 , a DNS response message including information on a first address corresponding to the first domain name and information on a first available period (for example, TTL) of the first address. The electronic device  110  may receive the DNS response message from the DNS server  120 . 
     In operation S 1025 , the DNS server  120  may transmit, to the electronic device  110 , a DNS response message including information on a second address corresponding to the second domain name and information on a second available period of the second address. The electronic device  110  may receive the DNS response message from the DNS server  120   
     Operation S 1020  and operation S 1025  may be performed simultaneously or in reverse order depending on the embodiment. Operation S 1015  and operation S 1020  may be performed simultaneously or in reverse order depending on the embodiment. 
     In operation S 1030 , the electronic device  110  may store the first address and the second address based on the DNS response message including the information on the first address and the information on the first available period of the first address and the DNS response message including the information on the second address and the information on the second available period of the second address. That is, the first address may be stored in the electronic device  110  during the first available period, and the second address may be stored in the electronic device  110  during the second available period. 
     In operation S 1035 , the electronic device  110  may stop storing the second address when the second available period expires, because the second address may be an address that is not cached in the DNS server  120  when the second available period expires. 
     However, when storing the second address is stopped before the designated interval, the electronic device  110  may not be able to use the received second address for parallel DNS signaling. That is, because the second available period is not a parameter determined by the electronic device  110 , the electronic device  110  may not obtain an effect of reducing a delay in parallel signaling due to a gap (difference) between the second available period and the designated interval. The electronic device  110  may perform complementary DNS signaling as follows in order to compensate for the difference between the second available period and the designated interval. 
     In operation S 1040 , the electronic device  110  may transmit a DNS query message including the information on the second domain name to the DNS server  120 . The electronic device  110  may transmit the DNS query message including the information on the second domain name to the DNS server  120  in order to acquire the address corresponding to the second domain name again. The DNS server  120  may receive the DNS query message including the information on the second domain name from the electronic device  110 . 
     In operation S 1045 , the DNS server  120  may transmit a DNS response message including information on a third address to the electronic device  110 . The electronic device  110  may receive the DNS response message from the DNS server  120 . The information on the third address may be information for supplementing the second address deleted from the electronic device  110 . The information on the third address may be information used to access a server indicated by the second domain name using the third address without DNS signaling when the electronic device  110  detects an input with respect to the second domain name. 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may compensate for a difference between an available period of an address and a designated interval through operation S 1010  to operation S 1045 . 
       FIG. 11A  illustrates another example of signal flow between an electronic device performing parallel DNS signaling and a DNS server according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 11A , the electronic device  110  may transmit a DNS query message including information on a first domain name and a flag to the DNS server  120  in operation S 1110 . The flag may include information to indicate that parallel DNS signaling is requested when parallel DNS signaling is available. The flag may be set in various formats. For example, when the flag includes one bit and is set to 1, the flag may indicate that parallel DNS signaling is requested. When the flag is set to 0, the flag may indicate that parallel DNS signaling is not requested. The DNS server  120  may receive the DNS query message from the electronic device  110 . 
     In operation S 1112 , the DNS server  120  may identify domain names associated with the first domain name. The DNS server  120  may identify the domain names associated with the first domain name based on a previously obtained pattern of the electronic device  110 . In some exemplary embodiments, the pattern of the electronic device  110  may be obtained by the DNS server  120  learning a usage pattern of the electronic device  110 . In some other exemplary embodiments, the pattern of the electronic device  110  may be transmitted from the electronic device  110  via a separate message. 
     In operation S 1114 , the DNS server  120  may transmit, to the electronic device  110 , a DNS response message including information on a first address corresponding to the first domain name and DNS response messages including information on addresses respectively corresponding to the domain names associated with the first domain name. The electronic device  110  may reduce DNS signaling caused by an input occurring after the first domain name by receiving the DNS response messages. That is, the electronic device  110  may improve the Internet access speed connection by receiving, in advance, an address for an Internet access input to occur subsequently. 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may perform parallel DNS signaling with relatively low complexity through operations S 1110  to S 1114 . 
       FIG. 11B  illustrates an example of signal flow between an electronic device performing parallel DNS signaling, a proxy server, and a DNS server according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 11B , the electronic device  110  may transmit a DNS query message including information on a first domain name and a flag to the proxy server  1110  in operation S 1120 . The proxy server may be a server for relaying between the electronic device  110  and the DNS server  120 . The proxy server  1110  may receive the DNS query message from the electronic device  110 . 
     In operation S 1122 , the proxy server  1110  may identify domain names associated with the first domain name. The proxy server  1110  may identify the domain names associated with the first domain name based on a previously obtained pattern of the electronic device  110 . In some exemplary embodiments, the pattern of the electronic device  110  may be obtained by the proxy server  1110  learning a usage pattern of the electronic device  110 . In some other exemplary embodiments, the pattern of the electronic device  110  may be transmitted from the electronic device  110  via a separate message. 
     In operation S 1124 , the proxy server  1110  may transmit, to the DNS server  120 , a DNS query message for requesting an address corresponding to the first domain name and DNS query messages for requesting addresses respectively corresponding to the domain names associated with the first domain name. The DNS server  120  may receive the DNS query messages. 
     In operation S 1126 , the DNS server  120  may transmit a DNS response message including information on a first address corresponding to the first domain name and DNS response messages including information on addresses respectively corresponding to the domain names associated with the first domain name to the electronic device  110  through the proxy server  1110 . The electronic device  110  may receive the DNS response messages from the DNS server  120  via the proxy server  1110 . 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may perform parallel DNS signaling via a proxy server through operations S 1120  to S 1126 . 
     As described above, a method of an electronic device according to various exemplary embodiments of the present disclosure may include: detecting a first input with respect to a first domain name; detecting a second input with respect to a second domain name within a designated interval after the first input is detected; storing the second domain name as a domain name associated with the first domain name in a storage unit included in the electronic device, in response to detection of the second input; and transmitting a message for requesting information on an address corresponding to the first domain name and a message for requesting information on an address corresponding to the second domain name to a DNS server in response to detection of a third input with respect to the first domain name. 
     In some exemplary embodiments, the method of the electronic device may further include receiving, from the DNS server, a message including information on a first address corresponding to the first domain name and information on an available period of the first address and a message including information on a second address corresponding to the second domain name and information on an available period of the second address. Here, the information on the available period of the first address may include information on time-to-live (TTL) of the first address, and the information on the available period of the second address may include information on TTL of the second address. The information on the first address may be stored in the storage unit during the available period of the first address, and the information on the second address may be stored in the storage unit during the available period of the second address. The method of the electronic device may further include: detecting a fourth input with respect to the second domain name within the available period of the second address; and transmitting a message for requesting data to a server indicated by the second address stored in the storage unit in response to detection of the fourth input. The method of the electronic device may further include: detecting the fourth input after the available period of the second address; transmitting a message for requesting information on an address corresponding to the second domain name to the DNS server in response to detection of the fourth input; receiving a message including information on a third address corresponding to the second domain name and information on an available period of the third address from the DNS server; and transmitting a message for requesting data from a server indicated by the third address within the available period of the third address. 
     In some exemplary embodiments, the stored second domain name may be discarded from the storage unit when no input occurs with respect to the second domain name during a predetermined period. 
     In some exemplary embodiments, the first input may include an input for controlling a first application, and the second input may include an input for controlling a second application, which is different from the first application. 
     In some exemplary embodiments, the method of the electronic device may further include: transmitting a message for requesting information on an address corresponding to the second domain name to the DNS server in response to detection of the second input; receiving a message including the information on the address corresponding to the second domain name from the DNS server; and transmitting a message for requesting data to a server indicated by the address corresponding to the second domain name. 
     In some exemplary embodiments, the message for requesting the information on the address corresponding to the first domain name and the message for requesting the information on the address corresponding to the second domain name may be transmitted to the DNS server through a wireless path. 
       FIG. 12  illustrates an example of a functional configuration of an electronic device according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 12 , a terminal  110  may include an antenna  1210 , a communication unit  1220 , a controller  1230 , a storage unit  1240 , an input unit  1250 , and/or a display unit  1260 . 
     The antenna  1210  may include one or more antennas. The antennas  1210  may be configured suitably for a multiple input multiple output (MIMO) method. 
     The communication unit  1220  may perform functions for transmitting or receiving a signal through a wired or wireless channel. 
     The communication unit  1220  may perform a function of converting between a baseband signal and a bit stream according to the physical layer specification of a system. For example, in data transmission, the communication unit  1220  may encode and modulate a transmitted bit stream to generate complex symbols. In another example, in data reception, the communication unit  1220  may demodulate and decode a baseband signal to reconstruct a received bit stream. 
     The communication unit  1220  may upconvert a baseband signal into a radio frequency (RF) band signal and may transmit the RF band signal through the antenna  1210 . The communication unit  1220  may downconvert an RF band signal received through the antenna  1210  into a baseband signal. For example, the communication unit  1220  may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), or the like. 
     The communication unit  1220  may be operatively coupled to the controller  1230 . 
     The communication unit  1220  may include at least one transceiver. 
     The controller  1230  may control the overall operation of the terminal  110 . For example, the controller  1230  may transmit or receive a signal through the communication unit  1220 . The controller  1230  may record data in the storage unit  1240  and may read the data recorded in the storage unit  1240 . To this end, the controller  1230  may include at least one processor. For example, the controller  1230  may include a communication processor (CP) to perform control for communication and an application processor (AP) to control a higher layer, such as an application program. 
     The controller  1230  may be configured to implement procedures and/or methods proposed in the present disclosure. 
     The storage unit  1240  may store a control command code, control data, or user data to control the terminal  110 . For example, the storage unit  1240  may include an application, an operating system (OS), middleware, and a device driver. 
     The storage unit  1240  may include at least one of a volatile memory and a non-volatile memory. The volatile memory may include a dynamic random-access memory (DRAM), a static rAM (SRAM), a synchronous DRAM (SDRAM), a phase-change RAM (PRAM), a magnetic RAM (MRAM), a resistive RAM (RRAM), a ferroelectric RAM (FeRAM), and the like. The non-volatile memory may include a read-only memory (ROM), a programmable rOM (PROM), an electrically programmable ROM (EPROM), an electrically erasable ROM (EEPROM), a flash memory, and the like. 
     The storage unit  1240  may include a non-volatile medium, such as a hard disk drive (HDD), a solid state disk (SSD), an embedded multimedia card (eMMC), and a universal flash storage (UFS). 
     The storage unit  1240  may be operatively coupled to the controller  1230 . 
     The input unit  1250  may detect an input made to the electronic device  110 . The input unit  1250  may be a touch panel. For example, the input unit  1250  may detect a touch with a finger, a touch with a pen, and/or a hovering input. The input unit  1250  may be a keyboard, a microphone, or the like. The input unit  1250  may generate an input with respect to a domain name, an input for running an application, or the like according to various exemplary embodiments of the present disclosure. 
     The input unit  1250  may be operatively coupled to the controller  1230 . 
     The display unit  1260  may display a result of processing in the electronic device  110 . The display unit  1260  may be a liquid crystal display (LCD) or organic light emitting diodes (OLED). 
     The display unit  1260  may be operatively coupled to the controller  1230 . 
     Depending on the embodiment, the input unit  1250  and the display unit  1260  may be designed as an integrated touch screen. 
       FIG. 13A  illustrates an example of a functional configuration included in a storage unit in an electronic device according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG. 13A , the storage unit  1240  may include a plurality of applications  1310  and an OS  1320 . 
     Each of the plurality of applications  1310  may be a program (or software) for providing a service to a user of the electronic device  110 . That is, each of the plurality of applications  1310  may be a program set for the user of the electronic device  110  to perform a specific task. For example, each of the plurality of applications  1310  may be a word processor for the user to create a document of a user, a web browser for assisting a user in Internet access, and the like. 
     Some of the plurality of applications  1310  may be applications that may utilize Internet access. For example, some of the plurality of applications  1310  may include a web browser application, an application for Internet shopping, an application for online gaming, an application for SNS, and the like. Some of the plurality of applications  1310  may be interconnected with the OS  1320  so that the user may conveniently access the Internet. In some exemplary embodiments, some of the plurality of applications  1310  may be associated with a domain name identifying unit  1330  in the OS  1320  in order to provide high accessibility for the user. 
     The OS  1320  may perform a function of logically connecting and controlling hardware in the electronic device  110 . The OS  1320  may perform a function of connecting each of the plurality of applications  1310  and the hardware in the electronic device  110 . 
     The OS  1320  may include the domain name identifying unit  1330 , a DNS precaching unit  1340 , a DNS look-up unit  1350 , and a DNS cache unit  1360 . 
     The domain name identifying unit  1330  may identify a domain name from an input made through the electronic device  110 . For example, when an input with respect to a link in a web page displayed on the display unit  1260  of the electronic device  110  is detected, the domain name identifying unit  1330  may identify a domain name from a URL indicated by the link. In another example, when an input with respect to a link in a web page displayed on the display unit  1260  of the electronic device  110  is detected, the domain name identifying unit  1330  may identify a domain name from a domain name (or host name) identified by some of the plurality of applications  1310  based on the link. In another example, when an input with respect to an object (for example, an icon or the like) for running an application requiring Internet access is detected, the domain name identifying unit  1330  may identify a domain name from a URL indicated by the object. In yet another example, when an input with respect to an object for running an application requiring Internet access is detected, the domain name identifying unit  1330  may identify a domain name from a domain name (or host name) identified by some of the plurality of applications  1310  based on a URL indicated by the object. In another example, when a URL connection is requested from an application stored in the electronic device  110 , the domain name identifying unit  1330  may identify a domain name from a URL. 
     The domain name identifying unit  1330  may provide the DNS precaching unit  1340  with information on the identified domain name. 
     The DNS precaching unit  1340  may perform the functions illustrated in  FIGS. 6, 7A, 8 , and  9 A so that the electronic device  110  may perform parallel DNS signaling. 
     For example, when a second input with respect to a second domain name is detected within a designated interval after a first input with respect to a first domain name is detected, the DNS precaching unit  1340  may store the second domain name as a domain name associated with the first domain name or may update information on the second domain name, which is already stored as a domain name associated with the first domain name. 
     In another example, the DNS precaching unit  1340  may manage the second domain name by time interval. For example, when the second input with respect to the second domain name is detected within the designated interval after the first input with respect to the first domain name is detected at a morning time, the DNS precaching unit  1340  may store the second domain name as a domain name associated with the first domain name in a region for the morning time. 
     In another example, the DNS precaching unit  1340  may manage the second domain name for respective users. For example, when the first input and the second input are caused by user A, the DNS precaching unit  1340  may store the second domain name as a domain name associated with the first domain name in a region for user A. 
     The DNS precaching unit  1340  may monitor the identified domain name so that the electronic device  110  may perform parallel DNS signaling. For example, when the first domain name is identified, the DNS precaching unit  1340  may detect that the first domain name is identified based on information on the identified first domain name provided by the domain name identifying unit  1330 . Also, the DNS precaching unit  1340  may check whether there is a domain name associated with the identified first domain name. For example, when there is a domain name associated with the identified first domain name, the DNS precaching unit  1340  may provide the information on the identified first domain name and information on the domain name associated with the identified first domain name to the DNS look-up unit  1350 . 
     The DNS look-up unit  1350  may perform a DNS query based on the information on the domain name provided from the DNS precaching unit  1340 . The DNS look-up unit  1350  may check whether an address corresponding to the provided domain name is stored in the DNS cache unit. When the address corresponding to the provided domain name is stored in the DNS cache unit  1360 , the DNS look-up unit  1350  may transmit a data request message to a server through the communication unit  1220  without a DNS signaling procedure. When the address corresponding to the provided domain name is not stored in the DNS cache unit  1360 , the DNS look-up unit  1350  may transmit a DNS query message to the DNS server through the communication unit  1220  in order to obtain the address corresponding to the provided domain name. 
     The DNS cache unit  1360  may store addresses corresponding to domain names. The DNS cache unit  1360  may store the addresses during available periods of the respective addresses. The DNS cache unit  1360  may provide the DNS look-up unit  1350  with address information when the DNS look-up unit  1350  makes a request. 
       FIG. 13B  illustrates another example of a functional configuration included in a storage unit in an electronic device according to various exemplary embodiments of the present disclosure. 
       FIG. 13B  is an example of designing a functional configuration performing a function the same as or similar to that of  FIG. 13A  in a different connection method. 
     Referring to  FIG. 13B , the storage unit  1240  may include a plurality of applications  1310  and an OS  1320  that are capable of performing functions the same as or similar to those of  FIG. 13A . 
     Some of the plurality of applications  1310  may be applications that utilize Internet access. When an application that requires Internet access requests a connection to a URL, a domain name identifying unit  1330  may identify a domain name from the URL. The domain name identifying unit  1330  may provide a DNS look-up unit  1350  with information on the identified domain name. 
     The DNS look-up unit  1350  may inquire of a DNS precaching unit  1340  whether there is a domain name associated with the identified domain name based on the provided information on the domain name. When there is a domain name associated with the identified domain name, the DNS precaching unit  1340  may provide the DNS look-up unit  1350  with information on the domain name associated with the identified domain name. The DNS look-up unit  1350  may inquire whether a DNS cache unit  1360  stores the information on the identified domain name and the information on the domain name associated with the identified domain name. When the DNS cache unit  1360  stores the information on the identified domain name and the information on the domain name associated with the identified domain name, the DNS cache unit  1360  may provide the DNS look-up unit  1350  with an address corresponding to the identified domain name and an address corresponding to the domain name associated with the identified domain name. The DNS look-up unit  1350  may transmit a data request message based on the provided addresses to a server through the communication unit  1220  without performing DNS signaling. When the information on the identified domain name and the information on the domain name associated with the identified domain name are not stored, the DNS cache unit  1360  may provide, to the DNS look-up unit  1350 , information indicating that no information on a queried address is stored. In this case, the DNS look-up unit  1350  may transmit a DNS query message to the DNS server. 
     When there is no domain name associated with the identified domain name, the DNS precaching unit  1340  may provide the DNS look-up unit  1350  with information indicating that there is no domain name associated with the identified domain name. The DNS look-up unit  1350  may inquire whether the DNS cache unit  1360  stores information on the identified domain name. When the information on the identified domain name is stored, the DNS cache unit  1360  may provide the DNS look-up unit  1350  with information on an address corresponding to the identified domain name. The DNS look-up unit  1350  may transmit a data request message based on the provided address to the server through the communication unit  1220  without performing DNS signaling. When no information on the identified domain name is stored, the DNS cache unit  1360  may provide the DNS look-up unit  1350  with information indicating that no information on the queried address is stored. In this case, the DNS look-up unit  1350  may transmit a DNS query message to the DNS server to query an address corresponding to the identified domain name. 
     The electronic device  110  according to various exemplary embodiments of the present disclosure may perform parallel DNS signaling through the logic flow of software illustrated in  FIGS. 13A and 13B . The electronic device  110  performs parallel DNS signaling, thereby quickly accessing the Internet. 
     As described above, an electronic device according to various exemplary embodiments of the present disclosure may include: a controller; an input unit configured to be operatively coupled to the controller; a communication unit configured to be operatively coupled to the controller; and a storage unit configured to be operatively coupled to the controller, wherein the controller may be configured to: detect a first input with respect to a first domain name; detect a second input with respect to a second domain name within a designated interval after the first input is detected; store the second domain name as a domain name associated with the first domain name in a storage unit included in the electronic device, in response to detection of the second input; and perform control to transmit a message for requesting information on an address corresponding to the first domain name and a message for requesting information on an address corresponding to the second domain name to a DNS server in response to detection of a third input with respect to the first domain name. 
     In some exemplary embodiments, the controller may be further configured to perform control to receive, from the DNS server, a message including information on a first address corresponding to the first domain name and information on an available period of the first address and a message including information on a second address corresponding to the second domain name and information on an available period of the second address. Further, the information on the available period of the first address may include information on time-to-live (TTL) of the first address, and the information on the available period of the second address may include information on TTL of the second address. Further, the information on the first address may be stored in the storage unit during the available period of the first address, and the information on the second address may be stored in the storage unit during the available period of the second address. In addition, the controller may be further configured to: detect a fourth input with respect to the second domain name within the available period of the second address; and perform control to transmit a message for requesting data to a server indicated by the second address stored in the storage unit in response to detection of the fourth input. The controller may be further configured to: detect the fourth input after the available period of the second address; perform control to transmit a message for requesting information on an address corresponding to the second domain name to the DNS server in response to detection of the fourth input; perform control to receive a message including information on a third address corresponding to the second domain name and information on an available period of the third address from the DNS server; and perform control to transmit a message for requesting data from a server indicated by the third address within the available period of the third address. 
     In some exemplary embodiments, the stored second domain address may be discarded from the storage unit when no input occurs with respect to the second domain name during a predetermined period. 
     In some exemplary embodiments, the first input may include an input for controlling a first application, and the second input may include an input for controlling a second application that is different from the first application. 
     In some exemplary embodiments, the controller may be further configured to: perform control to transmit a message for requesting information on an address corresponding to the second domain name to the DNS server in response to detection of the second input; perform control to receive a message including the information on the address corresponding to the second domain name from the DNS server; and perform control to transmit a message for requesting data to a server indicated by the address corresponding to the second domain name. 
     In some exemplary embodiments, the message for requesting the information on the address corresponding to the first domain name and the message for requesting the information on the address corresponding to the second domain name may be transmitted to the DNS server through a wireless path. 
     According to the present disclosure, specific operations described as being performed by various types of servers (for example, the DNS server  120 , the content server  130 , or the like) may be performed by another entity that functions similarly to a server depending on the embodiment. That is, it will be obvious that various operations performed for communication with an electronic device in a network including a plurality of network nodes including a server may be performed by the server or by network nodes other than the server. 
     Methods according to embodiments stated in claims and/or specifications of the present disclosure may be implemented in hardware, software, or a combination of hardware and software. 
     When the methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors within the electronic device. The at least one program may include instructions that cause the electronic device to perform the methods according to various embodiments of the present disclosure as defined by the appended claims and/or disclosed herein. 
     The programs (software modules or software) may be stored in non-volatile memories including a random access memory and a flash memory, a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a magnetic disc storage device, a compact disc-rOM (CD-ROM), digital versatile discs (DVDs), or other type optical storage devices, or a magnetic cassette. Alternatively, any combination of some or all of the may form a memory in which the program is stored. Further, a plurality of such memories may be included in the electronic device. 
     In addition, the programs may be stored in an attachable storage device which may access the electronic device through communication networks such as the internet, intranet, local area network (LAN), wide lAN (WLAN), and storage area network (SAN) or a combination thereof. Such a storage device may access the electronic device via an external port. Further, a separate storage device on the communication network may access a portable electronic device. 
     In the above-described detailed embodiments of the present disclosure, a component included in the present disclosure is expressed in the singular or the plural according to a presented detailed embodiment. However, the singular form or plural form is selected for convenience of description suitable for the presented situation, and various embodiments of the present disclosure are not limited to a single element or multiple elements thereof. Further, either multiple elements expressed in the description may be configured into a single element or a single element in the description may be configured into multiple elements. 
     While the present disclosure has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be defined as being limited to the embodiments, but should be defined by the appended claims and equivalents thereof. 
     Although the present disclosure has been described with an exemplary embodiment, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.