Patent Publication Number: US-11397598-B2

Title: Electronic device for performing authentication by using multiple biometric sensors and operation method thereof

Description:
BACKGROUND ART 
     Various embodiments of the disclosure relate to an electronic device for supporting a plurality of biometric recognition methods, and an operating method thereof. 
     With the development of information and communication technology and semiconductor technology, various types of electronic devices are evolving into multimedia devices providing a diversity of multimedia services. For example, electronic devices can provide a variety of multimedia services, such as a broadcast service, a wireless Internet service, a camera service, and a music playback service. 
     As being used by an increasing number of users, electronic devices provide various user interfaces for users. For example, electronic devices provide an authentication screen for inputting user authentication information (e.g., fingerprint information, pattern information, password information, iris information, face information, and the like). 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     An electronic device may authenticate a user on the basis of authentication information obtained using at least one biometric recognition sensor. For example, the electronic device may obtain a face image, a fingerprint image, an iris image, or the like as the authentication information and may compare the authentication information with a reference template as reference information used for authentication, thereby authenticating the user. 
     User authentication using the electronic device may be performed in various situations. However, an adverse effect may occur to the biometric recognition sensor during an authentication operation. Accordingly, the electronic device may obtain authentication information having a low similarity with that of the reference template, thus reducing the user authentication rate of the electronic device. 
     An electronic device and a method according to various embodiments of the disclosure may provide the recognition rate of a biometric recognition method on the basis of context information. 
     An electronic device and a method according to various embodiments of the disclosure may recommend a biometric recognition suitable for an authentication operation. 
     An electronic device according to various embodiments of the disclosure may include: a first biometric sensor configured to obtain biometric information using a first method; a second biometric sensor configured to obtain the biometric information or different biometric information using a second method; a display; and a processor, wherein the processor may be configured to: obtain context information associated with the first method and the second method; select at least one method of the first method and the second method on the basis of at least part of the context information; and display at least one graphic object corresponding to the at least one method for authentication. 
     An electronic device according to various embodiments of the disclosure may include: a first biometric sensor configured to obtain biometric information using a first method; a second biometric sensor configured to obtain the biometric information or different biometric information using a second method; a display; and a processor, wherein the processor may be configured to: obtain context information associated with the first method and the second method; identify a first success rate, at which authentication is successful with the biometric information to be obtained via the first method, and a second success rate, at which authentication is successful with the biometric information and the different biometric information to be obtained via the second method, on the basis of at least part of the context information; and display a graphic object corresponding to the first method and a graphic object corresponding to the second method on the display on the basis of at least part of the first success rate and the second success rate. 
     An operating method of an electronic device according to various embodiments of the disclosure may include: obtaining context information associated with a first biometric recognition method and a second biometric recognition method; identifying a first success rate, at which authentication is successful with biometric information to be obtained via the first biometric recognition method, and a second success rate, at which authentication is successful with biometric information to be obtained via the second biometric recognition method, on the basis of at least part of the context information; and displaying a graphic object corresponding to the first method and a graphic object corresponding to the second method on the basis of at least part of the first success rate and the second success rate. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  illustrates an electronic device in a network environment according to various embodiments; 
         FIG. 2  is a block diagram illustrating an electronic device according to various embodiments; 
         FIG. 3  is a block diagram illustrating a program module according to various embodiments; 
         FIG. 4  illustrates the configuration of a processor according to various embodiments of the disclosure; 
         FIG. 5  is a flowchart illustrating a procedure for performing an authentication operation of an electronic device according to various embodiments of the disclosure; 
         FIG. 6  is a flowchart illustrating a procedure for performing an authentication operation of an electronic device according to various embodiments of the disclosure; 
         FIG. 7  shows an example illustrating an authentication procedure according to various embodiments of the disclosure; 
         FIG. 8  is a flowchart illustrating a procedure in which an electronic device processes authentication through a selected biometric recognition method according to various embodiments of the disclosure; 
         FIG. 9A  and  FIG. 9B  show examples illustrating a procedure for processing a biometric recognition method according to various embodiments of the disclosure; 
         FIG. 10  is a flowchart illustrating a procedure in which an electronic device performs an authentication operation on the basis of a selected biometric recognition method according to various embodiments of the disclosure; 
         FIG. 11  shows an example illustrating an authentication operation according to various embodiments of the disclosure; 
         FIG. 12  is a flowchart illustrating a procedure in which an electronic device performs an authentication operation on the basis of a selected biometric recognition method according to various embodiments of the disclosure; 
         FIG. 13  shows an example illustrating a procedure for performing an authentication operation according to various embodiments of the disclosure; 
         FIG. 14  is a flowchart illustrating a procedure in which an electronic device performs an authentication operation for an application according to various embodiments of the disclosure; 
         FIG. 15A  and  FIG. 15B  show examples illustrating a procedure for performing an authentication operation according to various embodiments of the disclosure; 
         FIG. 16  is a flowchart illustrating a procedure for performing an authentication operation of an electronic device according to various embodiments of the disclosure; 
         FIG. 17  shows an example illustrating a procedure for performing an authentication operation according to various embodiments of the disclosure; 
         FIG. 18  is a flowchart illustrating a procedure in which an electronic device outputs authentication suitability according to various embodiments of the disclosure; 
         FIG. 19  shows an example illustrating a procedure for outputting authentication suitability according to various embodiments of the disclosure; 
         FIG. 20  is a flowchart illustrating a procedure in which an electronic device outputs guide information for improving authentication suitability according to various embodiments of the disclosure; 
         FIG. 21  is a flowchart illustrating a procedure in which an electronic device determines a biometric recognition method to use for authentication according to various embodiments of the disclosure; 
         FIG. 22A  and  FIG. 22B  show examples illustrating a procedure for changing a biometric recognition method according to various embodiments of the disclosure; 
         FIG. 23  is a flowchart illustrating another procedure for performing an authentication operation of an electronic device according to various embodiments of the disclosure; 
         FIG. 24  is a flowchart illustrating a procedure in which an electronic device detects user input while outputting authentication suitability according to various embodiments of the disclosure; and 
         FIG. 25A  to  FIG. 25C  show examples illustrating an authentication operation according to various embodiments of the disclosure. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, various embodiments of the present document are mentioned below with reference to the accompanying drawings. An embodiment and the terms used in this do not intend to limit the technology mentioned in the present document to a specific embodiment form, and should be construed as including various changes of the corresponding embodiment, equivalents thereof, and/or alternatives thereof. In the drawings, like reference symbols may denote like constituent elements. The expression of a singular form may include the expression of a plural form unless otherwise dictating clearly in context. In the present document, the expressions “A or B”, “at least one of A and/or B”, etc. may include all available combinations of words enumerated together. The expressions “1st”, “2nd”, “first”, “second”, etc. may modify corresponding constituent elements irrespective of order and/or importance, and are just used to distinguish one constituent element from another constituent element and do not limit the corresponding constituent elements. When it is mentioned that any (e.g., 1st) constituent element is “(operatively or communicatively) coupled with/to” or is “connected to” another (e.g., 2nd) constituent element, the any constituent element may be directly coupled to the another constituent element, or be coupled through a further constituent element (e.g., a third constituent element). 
     The expression “configured (or set) to˜” used in the present document may be used interchangeably with, for example, “suitable for˜”, “having the capacity to˜”, “designed to˜”, “adapted to˜”, “made to˜”, or “capable of˜” in a hardware or software manner in accordance to circumstances. In any situation, the expression “device configured to˜” may represent that the device is “capable of˜” together with other devices or components. For example, the phrase “processor configured (or set) to perform A, B and C” may represent an exclusive processor (e.g., embedded processor) for performing a corresponding operation, or a generic-purpose processor (e.g., a central processing unit (CPU) or an application processor (AP)) capable of performing corresponding operations by executing one or more software programs stored in a memory device. 
     An electronic device according to various embodiments of the present document may, for example, include at least one of a smartphone, a tablet personal computer (PC), a mobile phone, a video phone, an electronic book reader, a desktop PC, a laptop PC, a netbook computer, a workstation, a server, a portable digital assistant (PDA), a portable multimedia player (PMP), an MPEG-1 audio layer-3 (MP3) player, a medical device, a camera or a wearable device. The wearable device may include at least one of an accessory type (e.g., a watch, a ring, a wristlet, an anklet, a necklace, glasses, a contact lens or a head-mounted-device (HMD)), a fabric or clothing integrated type (e.g., electronic clothes), a human-body mount type (e.g., a skin pad or tattoo) or a bio implantation type (e.g., an implantable circuit). According to certain embodiment, the electronic device may, for example, include at least one of a television (TV), a digital versatile disc (DVD) player, an audio system, a refrigerator, an air conditioner, a cleaner, an oven, a microwave, a washing machine, an air cleaner, a set-top box, a home automation control panel, a security control panel, a media box (for example, Samsung HomeSync™, Apple TV™ or Google TV™), a game console (e.g., Xbox™ or PlayStation™), an electronic dictionary, an electronic locking system, a camcorder or an electronic frame. 
     In another embodiment, the electronic device may include at least one of various medical devices (e.g., various portable medical measurement devices (e.g., a blood glucose sensor, a heat rate sensor, a blood pressure monitor, a body temperature meter, etc.), magnetic resonance angiography (MRA), magnetic resonance imaging (MRI), computed tomography (CT), a imaging equipment, an ultrasonic instrument, etc.)), a navigation device, a global navigation satellite system (GNSS), an event data recorder (EDR), a flight data recorder (FDR), a car infotainment device, an electronic equipment for ship (e.g., a vessel navigation device, a gyro compass, etc.), avionics, a security device, a car head unit, an industrial or domestic robot, a drone, an automatic teller&#39;s machine (ATM) of a financial institution, point of sales (POS) of shops, an internet of things (IoT) device (e.g., an electric bulb, various sensors, a sprinkler device, a fire alarm, a thermostat, a streetlight, a toaster, an exerciser, a hot water tank, a heater, a boiler, etc.). 
     According to certain embodiment, the electronic device may include at least one of a part of furniture, a building/structure or a car, an electronic board, an electronic signature receiving device, a projector or various metering devices (e.g., tap water, electricity, gas, radio wave metering devices or the like). In various embodiments, the electronic device may be flexible, or be a combination of two or more of the aforementioned various devices. The electronic device according to an embodiment of the present document is not limited to the aforementioned devices. 
     In the present document, the term ‘user’ may denote a person who uses the electronic device or a device (e.g., an artificial-intelligent electronic device) which uses the electronic device. 
     Referring to  FIG. 1 , an electronic device  101  within a network environment  100  in various embodiments is described. The electronic device  101  may include a bus  110 , a processor  120 , a memory  130 , an input output interface  150 , a display  160 , and a communication interface  170 . In some embodiment, the electronic device  101  may omit at least one of the constituent elements or additionally have another constituent element. 
     The bus  110  may, for example, include a circuit coupling the constituent elements  110 ,  120 ,  150 ,  160  and  170  with one another and forwarding communication (e.g., a control message or data) between the constituent elements. 
     The processor  120  may include one or more of a central processing unit (CPU), an application processor (AP) or a communication processor (CP). The processor  120  may, for example, execute operation or data processing for control and/or communication of at least one another constituent element of the electronic device  101 . 
     The memory  130  may include a volatile and/or non-volatile memory. The memory  130  may, for example, store a command or data related to at least one another constituent element of the electronic device  101 . 
     According to an embodiment, the memory  130  may store a software and/or program  140 . The program  140  may, for example, include a kernel  141 , a middleware  143 , an application programming interface (API)  145 , an application program (or “application”)  147 , and the like. At least some of the kernel  141 , the middleware  143  or the API  145  may be called an operating system (OS). The kernel  141  may, for example, control or manage system resources (e.g., bus  110 , processor  120 , memory  130 , and the like) that are used for executing operations or functions implemented in other programs (e.g., middleware  143 , API  145  or application program  147 ). 
     Also, the kernel  141  may provide an interface through which the middleware  143 , the API  145  or the application program  147  may control or manage the system resources of the electronic device  101  by accessing the individual constituent element of the electronic device  101 . 
     The middleware  143  may, for example, perform a relay role of enabling the API  145  or the application program  147  to communicate and exchange data with the kernel  141 . Also, the middleware  143  may process one or more work requests that are received from the application program  147 , in accordance with priority. For example, the middleware  143  may grant priority capable of using the system resources (e.g., the bus  110 , the processor  120 , the memory  130  or the like) of the electronic device  101  to at least one of the application programs  147 , and process one or more work requests. 
     The API  145  is, for example, an interface enabling the application program  147  to control a function provided by the kernel  141  or the middleware  143  and may, for example, include at least one interface or function (e.g., an instruction) for file control, window control, image processing, character control or the like. 
     The input output interface  150  may forward a command or data inputted from a user or another external device, to another constituent element(s) of the electronic device  101 , or output a command or data received from the another constituent element(s) of the electronic device  101 , to the user or another external device. 
     The display  160  may, for example, include a liquid crystal display (LCD), a light emitting diode (LED) display, an organic light emitting diode (OLED) display, a microelectromechanical systems (MEMS) display or an electronic paper display. The display  160  may, for example, display various contents (e.g., a text, an image, a video, an icon, a symbol and/or the like) to a user. The display  160  may include a touch screen. And, for example, the display  160  may receive a touch, gesture, proximity or hovering input that uses an electronic pen or a part of the user&#39;s body. 
     The communication interface  170  may, for example, establish communication between the electronic device  101  and an external device (e.g., the first external electronic device  102 , the second external electronic device  104  or the server  106 ). For example, the communication interface  170  may be coupled to a network  162  through wireless communication or wired communication, to communicate with the external device (e.g., the second external electronic device  104  or the server  106 ). The wireless communication may, for example, include a cellular communication that uses at least one of long term evolution (LTE), LTE-advanced (LTE-A), code division multiple access (CDMA), wideband CDMA (WCDMA), universal mobile telecommunications system (UMTS), wireless broadband (WiBro), global system for mobile communications (GSM) and the like. According to an embodiment, the wireless communication may, for example, include at least one of wireless fidelity (WiFi), Bluetooth (BT), Bluetooth low energy (BLE), Zigbee, near field communication (NFC), magnetic secure transmission (MST), radio frequency (RF) or body area network (BAN). According to an embodiment, the wireless communication may include GNSS. The GNSS may, for example, be a global positioning system (GPS), a global navigation satellite system (Glonass), Beidou navigation satellite system (hereinafter, “Beidou”)) or Galileo, the European global satellite-based navigation system. Hereinafter, the “GPS” may be used interchangeably with the “GNSS”. The wired communication may, for example, include at least one of a universal serial bus (USB), a high definition multimedia interface (HDMI), a recommended standard-232 (RS-232), power line communication (PLC), a plain old telephone service (POTS), and the like. 
     The network  162  may include at least one of a telecommunications network, for example, a computer network (e.g., local area network (LAN) or wide area network (WAN)), the Internet or a telephone network. 
     Each of the first and second electronic devices  102  and  104  may be a device of the same or different type from that of the electronic device  101 . According to various embodiments, all or some of operations executed in the electronic device  101  may be executed in another one electronic device or a plurality of electronic devices (e.g., the electronic devices  102  and  104  or the server  106 ). According to an embodiment, where the electronic device  101  performs some function or service automatically or in response to a request, the electronic device  101  may, instead of or additionally to executing the function or service in itself, send a request for execution of at least a partial function associated with this to another device (e.g., electronic device  102 ,  104  or server  106 ). The another electronic device (e.g., electronic device  102 ,  104  or server  106 ) may execute the requested function or additional function, and forward the execution result to the electronic device  101 . The electronic device  101  may process the received result as it is or additionally, to provide the requested function or service. For this, a cloud computing, distributed computing or client-server computing technology may be used, for example. 
       FIG. 2  illustrates a block diagram of an electronic device according to an embodiment of the present disclosure. 
     Referring to  FIG. 2 , an electronic device  201  may, for example, include the entire or part of the electronic device  101  illustrated in  FIG. 1 . The electronic device  201  may include one or more processors (e.g., application processor (APs))  210 , a communication module  220 , a subscriber identification module  224 , a memory  230 , a sensor module  240 , an input device  250 , a display  260 , an interface  270 , an audio module  280 , a camera module  291 , a power management module  295 , a battery  296 , an indicator  297  and a motor  298 . 
     The processor  210  may, for example, drive an operating system or an application program to control a majority of hardware or software constituent elements coupled to the processor  210 , and may perform various data processing and operations. The processor  210  may be, for example, implemented as a system on chip (SoC). According to an embodiment, the processor  210  may further include a graphic processing unit (GPU) and/or an image signal processor (ISP). 
     The processor  210  may include at least some (e.g., cellular module  221 ) of the constituent elements illustrated in  FIG. 2  as well. The processor  210  may load a command or data received from at least one of the other constituent elements (e.g., non-volatile memory), to a volatile memory, to process the loaded command or data, and store the result data in the non-volatile memory. 
     The communication module  220  may, for example, have the same or similar construction with the communication interface  170 . The communication module  220  may, for example, include a cellular module  221 , a WiFi module  223 , a Bluetooth module  225 , a GNSS module  227 , a near field communication (NFC) module  228 , and a radio frequency (RF) module  229 . The cellular module  221  may, for example, provide voice telephony, video telephony, a text service, an Internet service or the like through a telecommunication network. According to an embodiment, the cellular module  221  may perform the distinction and authentication of the electronic device  201  within the telecommunication network, by using the subscriber identification module (e.g., SIM card)  224 . According to an embodiment, the cellular module  221  may perform at least some functions among functions that the processor  210  may provide. According to an embodiment, the cellular module  221  may include a communication processor (CP). According to some embodiment, at least some (e.g., two or more) of the cellular module  221 , the WiFi module  223 , the Bluetooth module  225 , the GNSS module  227  or the NFC module  228  may be included within one integrated chip (IC) or IC package. The RF module  229  may, for example, transceive a communication signal (e.g., RF signal). The RF module  229  may, for example, include a transceiver, a power amplifier module (PAM), a frequency filter, a low noise amplifier (LNA), an antenna or the like. According to another embodiment, at least one of the cellular module  221 , the WiFi module  223 , the Bluetooth module  225 , the GNSS module  227  or the NFC module  228  may transceive an RF signal through a separate RF module. 
     The subscriber identification module  224  may, for example, include a card including a subscriber identification module and/or an embedded SIM. And, the subscriber identification module  224  may include unique identification information (e.g., integrated circuit card identifier (ICCID)) or subscriber information (e.g., international mobile subscriber identity (IMSI)). 
     The memory  230  (e.g., memory  130 ) may, for example, include an internal memory  232  or an external memory  234 . The internal memory  232  may, for example, include at least one of a volatile memory (e.g., a dynamic random access memory (DRAM), a static RAM (SRAM), a synchronous dynamic RAM (SDRAM) or the like) and a non-volatile memory (e.g., one time programmable read only memory (OTPROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically EPROM (EEPROM), a mask ROM, a flash ROM, a flash memory, a hard drive or a solid state drive (SSD)). The external memory  234  may include a flash drive, for example, a compact flash (CF), a secure digital (SD), a micro-SD, a mini-SD, an extreme Digital (xD), a Multi Media Card (MMC), a memory stick or the like. The external memory  234  may be operatively or physically coupled with the electronic device  201  through various interfaces. 
     The sensor module  240  may, for example, measure a physical quantity or sense an activation state of the electronic device  201 , to convert measured or sensed information into an electrical signal. The sensor module  240  may, for example, include at least one of a gesture sensor  240 A, a gyro sensor  240 B, a barometer  240 C, a magnetic sensor  240 D, an acceleration sensor  240 E, a grip sensor  240 F, a proximity sensor  240 G, a color sensor  240 H (e.g., a red, green, blue (RGB) sensor), a biometric (medical) sensor  240 I, a temperature/humidity sensor  240 J, an ambient light (illuminance) sensor  240 K or an ultra violet (UV) sensor  240 M. Additionally or alternatively, the sensor module  240  may, for example, include an E-nose sensor, an electromyography (EMG) sensor, an electroencephalogram (EEG) sensor, an electrocardiogram (ECG) sensor, an infrared (IR) sensor, an iris scan sensor and/or a finger scan sensor. The sensor module  240  may further include a control circuit for controlling at least one or more sensors belonging therein. In some embodiment, the electronic device  201  may further include a processor configured to control the sensor module  240  as a part of the processor  210  or separately, thereby controlling the sensor module  240  while the processor  210  is in a sleep state. 
     The input device  250  may, for example, include a touch panel  252 , a (digital) pen sensor  254 , a key  256  or an ultrasonic input device  258 . The touch panel  252  may, for example, use at least one scheme among a capacitive overlay scheme, a pressure sensitive scheme, an infrared beam scheme or an ultrasonic scheme. Also, the touch panel  252  may further include a control circuit as well. The touch panel  252  may further include a tactile layer, to provide a tactile response to a user. The (digital) pen sensor  254  may, for example, be a part of the touch panel  252 , or include a separate sheet for recognition. The key  256  may, for example, include a physical button, an optical key or a keypad. The ultrasonic input device  258  may sense an ultrasonic wave generated in an input tool, through a microphone (e.g., microphone  288 ), to confirm data corresponding to the sensed ultrasonic wave. 
     The display  260  (e.g., the display  160 ) may include a panel  262 , a hologram device  264 , a projector  266 , a display driver interface (DDI)  268 , and/or a control circuit for controlling them. The panel  262  may, for example, be implemented to be flexible, transparent, or wearable. The panel  262  may be constructed as one or more modules together with the touch panel  252 . The panel  262  may include a pressure sensor which may measure the strength of pressure of a user&#39;s touch. The pressure sensor may be implemented so as to be integrated with the touch panel  252  or may be implemented as one or more sensors separate from the touch panel  252 . 
     The hologram device  264  may show a three-dimensional image to the air using an interference of light. The projector  266  may project light onto a screen, to display an image. The screen may, for example, be located inside or outside the electronic device  201 . 
     The interface  270  may, for example, include an HDMI  272 , a USB  274 , an optical interface  276  or a D-subminiature (D-sub)  278 . The interface  270  may, for example, be included in the communication interface  170  illustrated in  FIG. 1 . Additionally or alternatively, the interface  270  may, for example, include a Mobile High-definition Link (MHL) interface, an SD card/Multi Media Card (MMC) interface or an Infrared Data Association (IrDA) standard interface. 
     The audio module  280  may, for example, convert a sound and an electrical signal interactively. At least some constituent elements of the audio module  280  may be, for example, included in the input output interface  150  illustrated in  FIG. 1 . The audio module  280  may for example, process sound information that is inputted or outputted through a speaker  282 , a receiver  284 , an earphone  286 , the microphone  288  or the like. 
     The camera module  291  is, for example, a device able to photograph a still image and a video. According to an embodiment, the camera module  291  may include one or more image sensors (e.g., front sensor or rear sensor), a lens, an image signal processor (ISP) or a flash (e.g., an LED, a xenon lamp or the like). 
     The power management module  295  may, for example, manage the electric power of the electronic device  201 . According to an embodiment, the power management module  295  may include a power management integrated circuit (PMIC), a charger IC or a battery or fuel gauge. The PMIC may, for example, employ a wired and/or wireless charging scheme. The wireless charging scheme may, for example, include a magnetic resonance scheme, a magnetic induction scheme, an electromagnetic wave scheme or the like. And, the wireless charging scheme may further include a supplementary circuit for wireless charging, for example, a coil loop, a resonance circuit, a rectifier or the like. The battery gauge may, for example, measure a level of the battery  296 , a voltage being in charge, an electric current or a temperature. 
     The battery  296  may, for example, include a rechargeable battery and/or a solar battery. 
     The indicator  297  may display a specific state, for example, a booting state, a message state, a charging state or the like of the electronic device  201  or a part (e.g., processor  210 ) of the electronic device  201 . 
     The motor  298  may convert an electrical signal into a mechanical vibration, and may generate a vibration, a haptic effect or the like. The electronic device  201  may, for example, include a mobile TV support device (e.g., GPU) capable of processing media data according to the standards of digital multimedia broadcasting (DMB), digital video broadcasting (DVB), mediaFlo™ or the like. Each of the constituent elements described in the present document may consist of one or more components, and a name of the corresponding constituent element may be varied according to the kind of the electronic device. In various embodiments, the electronic device (e.g., electronic device  201 ) may omit some constituent elements, or further include additional constituent elements, or combine some of the constituent elements to configure one entity, but identically perform functions of corresponding constituent elements before combination. 
       FIG. 3  illustrates a block diagram of a program module according to various embodiments. According to an embodiment, the program module  310  (e.g., the program  140 ) may include an operating system (OS) controlling resources related to an electronic device (e.g., the electronic device  101 ) and/or various applications (e.g., the application program  147 ) run on the operating system. The operating system may, for example, include Android™, iOS™, Windows™, Symbian™, Tizen™, or Bada™. 
     Referring to  FIG. 3 , the program module  310  may include a kernel  320  (e.g., the kernel  141 ), a middleware  330  (e.g., the middleware  143 ), an API  360  (e.g., the API  145 ), and/or an application  370  (e.g., the application program  147 ). At least a part of the program module  310  may be preloaded onto an electronic device, or be downloadable from an external electronic device (e.g., the electronic device  102  or  104 , the server  106 , etc.). 
     The kernel  320  may, for example, include a system resource manager  321  and/or a device driver  323 . The system resource manager  321  may perform control of a system resource, allocation thereof, or recovery thereof. According to an embodiment, the system resource manager  321  may include a process management unit, a memory management unit, or a file system management unit. The device driver  323  may, for example, include a display driver, a camera driver, a Bluetooth driver, a shared memory driver, a USB driver, a keypad driver, a WiFi driver, an audio driver, or an inter-process communication (IPC) driver. 
     The middleware  330  may, for example, provide a function that the application  370  needs in common, or provide various functions to the application  370  through the API  360  wherein the application  370  may make use of restricted system resources within an electronic device. According to an embodiment, the middleware  330  may include at least one of a runtime library  335 , an application manager  341 , a window manager  342 , a multimedia manager  343 , a resource manager  344 , a power manager  345 , a database manager  346 , a package manager  347 , a connectivity manager  348 , a notification manager  349 , a location manager  350 , a graphic manager  351 , or a security manager  352 . 
     The runtime library  335  may, for example, include a library module that a compiler utilizes so as to add a new function through a programming language while the application  370  is executed. The runtime library  335  may perform input output management, memory management, or arithmetic function processing. The application manager  341  may, for example, manage a lifecycle of the application  370 . The window manager  342  may manage a GUI resource which is used for a screen. The multimedia manager  343  may obtain a format used for playing media files, and perform encoding or decoding of the media file by using a codec suitable to the corresponding format. The resource manager  344  may manage a source code of the application  370  or a space of a memory. The power manager  345  may, for example, manage a battery capacity, temperature or power supply, and identify or provide power information used for an operation of an electronic device by using corresponding information among this. According to an embodiment, the power manager  345  may interwork with a basic input/output system (BIOS). The database manager  346  may, for example, provide, search or change a database that will be used in the application  370 . The package manager  347  may manage the installing or refining of an application that is distributed in the form of a package file. The connectivity manager  348  may, for example, manage wireless connectivity. The notification manager  349  may, for example, provide an event such as an arrival message, an appointment, a proximity notification, etc. to a user. The location manager  350  may, for example, manage location information of an electronic device. The graphic manager  351  may, for example, manage a graphic effect that will be provided to the user, or a user interface related with this. The security manager  352  may, for example, provide system security or user authentication. 
     According to an embodiment, the middleware  330  may include a telephony manager for managing a voice or video call function of the electronic device, or a middleware module capable of forming a combination of functions of the aforementioned constituent elements. According to an embodiment, the middleware  330  may provide a module that is specialized by type of an operating system. The middleware  330  may dynamically delete some of the existing constituent elements, or add new constituent elements. 
     The API  360  is, for example, a set of API programming functions, and may be provided to have another construction according to the operating system. For example, Android or iOS may provide one API set by platform, and Tizen may provide two or more API sets by platform. 
     The application  370  may, for example, include a home  371 , a dialer  372 , a short message service (SMS)/multimedia message service (MMS)  373 , an instant message (IM)  374 , a browser  375 , a camera  376 , an alarm  377 , a contact  378 , a voice dial  379 , an electronic mail (e-mail)  380 , a calendar  381 , a media player  382 , an album  383 , a watch  384 , a health care (e.g., measuring a momentum, a blood sugar or the like), or an environment information (e.g., air pressure, humidity, or temperature information) provision application. According to an embodiment, the application  370  may include an information exchange application capable of supporting information exchange between an electronic device and an external electronic device. The information exchange application may, for example, include a notification relay application for relaying specific information to the external electronic device, or a device management application for managing the external electronic device. For example, the notification relay application may relay notification information provided in another application of the electronic device, to the external electronic device, or receive notification information from the external electronic device and provide the received notification information to a user. The device management application may, for example, install, delete, or refine a function (e.g., turned-on/turned-off of the external electronic device itself (or some components) or adjustment of a brightness (or resolution) of a display) of the external electronic device which communicates with the electronic device, or an application which operates in the external electronic device. According to an embodiment, the application  370  may include an application (e.g., a health care application of a mobile medical instrument) designated according to properties of the external electronic device. According to an embodiment, the application  370  may include an application received from the external electronic device. At least a part of the program module  310  may be implemented (e.g., executed) as software, firmware, hardware (e.g., the processor  210 ), or a combination of at least two or more of them, and may include a module for performing one or more functions, a program, a routine, sets of instructions or a process. 
     The term “module” used in the document may include a unit consisting of hardware, software or firmware, and may be, for example, used interchangeably with the term “logic”, “logic block”, “component”, “circuitry” or the like. The “module” may be an integrally configured component or the minimum unit performing one or more functions or a part thereof. The “module” may be implemented mechanically or electronically, and may, for example, include an application-specific integrated circuit (ASIC) chip, a field-programmable gate array (FPGA) or a programmable logic device, which has been known or will be developed in future, performing some operations. At least a part of an apparatus (e.g., modules or functions thereof) or method (e.g., operations) according to various embodiments may, for example, be implemented as an instruction which is stored in a computer-readable storage medium (e.g., the memory  130 ) in the form of a program module. In response to the instruction being executed by a processor (e.g., the processor  120  of  FIG. 1 ), the processor may perform a function corresponding to the instruction. The computer-readable recording medium may include a hard disk, a floppy disk, a magnetic medium (e.g., a magnetic tape), an optical recording medium (e.g., a compact disk-read only memory (CD-ROM), a digital versatile disk (DVD)), a magneto-optical medium (e.g., a floptical disk), an internal memory, etc. The instruction may include a code which is made by a compiler or a code which is executable by an interpreter. The module or program module according to various embodiments may include at least one or more of the aforementioned constituent elements, or omit some of them, or further include another constituent element. Operations carried out by the module, the program module or the another constituent element according to various embodiments may be executed in a sequential, parallel, repeated or heuristic manner, or at least some operations may be executed in different order or may be omitted, or another operation may be added. 
       FIG. 4  illustrates the configuration of a processor  400  according to various embodiments of the disclosure. According to one embodiment, the processor  400  may be a processor (e.g., the processor  120  or  210 ) of an electronic device (e.g., the electronic device  101  or the electronic device  201 ). 
     Referring to  FIG. 4 , the processor  400  may include a determination module  402 , an authentication module  404 , and an output control module  406 . 
     According to various embodiments, the determination module  402  may determine the authentication suitability of at least one biometric recognition method (or biometric recognition sensor). Authentication suitability may be a value indicating the degree to which a biometric recognition method is suitable to be used for user authentication. For example, authentication suitability may include the success rate at which authentication is successful with information to be obtained via a biometric recognition method. According to one embodiment, the determination module  402  may obtain context information associated with each biometric recognition method available for authentication using a plurality of sensors (e.g., the sensor module  240  of  FIG. 2 ) of the electronic device. Further, the determination module  402  may determine the authentication suitability of each biometric recognition method on the basis of the context information associated with each biometric recognition method. For example, when it is determined that authentication information unsuitable for authentication may be obtained by at least one biometric recognition method, the determination module  402  may determine that the authentication suitability of the at least one biometric recognition method is low on the basis of context information. Further, when it is determined that authentication information suitable for authentication may be obtained by at least one biometric recognition method, the determination module  402  may determine that the authentication suitability of the at least one biometric recognition method is high on the basis of context information. 
     For example, the determination module  402  may collect context information associated with at least one of external illuminance information of the electronic device, a movement of the electronic device, and the orientation of the electronic device in order to determine the authentication suitability of a face authentication method. For example, when the processor  400  uses the face authentication method in a state where an illuminance is darker than a predefined brightness, authentication information including noise may be obtained through an image sensor. Accordingly, the determination module  402  may determine the illuminance to be darker than the predefined brightness as context information in which unsuitable authentication information may be obtained. Further, when the processor  400  uses the face authentication method in a state where a movement of the electronic device greater than a predefined movement occurs, authentication information having the contour of a face which is not clear may be obtained through the image sensor. Accordingly, the determination module  402  may determine the movement of the electronic device to be greater than the predefined movement as context information in which unsuitable authentication information may be obtained. In addition, when the processor  400  uses the face authentication method in a state where the orientation of the electronic device is out of a predefined angle, authentication information having a face which does not look forward may be obtained through the image sensor. Accordingly, the determination module  402  may determine the orientation of the electronic device which is out of the predefined angle as context information in which unsuitable authentication information may be obtained. 
     In another example, the determination module  402  may collect context information associated with at least one of illuminance information, movement information about the electronic device, and orientation information about the electronic device in order to determine the authentication suitability of an iris authentication method. As described above, the determination module  402  may determine the illuminance to be darker than the predefined brightness, a movement of the electronic device greater than the predefined movement, and the orientation of the electronic device which is out of the predefined angle as context information in which unsuitable authentication information may be obtained. Further, when the processor  400  uses the iris authentication method in a state where an illuminance exceeds the predefined brightness, authentication information having an iris narrowed by an expanded pupil may be obtained through an iris sensor. Accordingly, the determination module  402  may determine the illuminance exceeding the predefined brightness as context information in which unsuitable authentication information may be obtained. 
     In still another example, the determination module  402  may collect context information associated with a state where a fingerprint sensor is damaged or the fingerprint sensor is stained with foreign material in order to determine the authentication suitability of a fingerprint authentication method. For example, when the processor  400  uses the fingerprint authentication method in the state where the fingerprint sensor is damaged or the fingerprint sensor is stained with foreign material, a distorted fingerprint image may be obtained or a fingerprint image may not be obtained through the fingerprint sensor. Accordingly, the determination module  402  may determine the state where the fingerprint sensor is damaged or the fingerprint sensor is stained with foreign material as context information in which unsuitable authentication information may be obtained. For example, when at least one reception (RX) line (e.g., a sensing electrode) receives a signal with a specified sensitivity or less or receives no signal with respect to a signal of at least one transmission (TX) line (e.g., a driver electrode) of the fingerprint sensor, the determination module  402  may determine that the fingerprint sensor is damaged. In addition, when a reference level of charges or less is continuously detected for a certain time at the intersection of at least one transmission (TX) line and at least one reception (RX) line of the fingerprint sensor, the determination module  402  may determine that the fingerprint sensor is stained with foreign material. 
     According to various embodiments, the determination module  402  may determine guide information for improving the recognition rate for at least one biometric recognition method by which user authentication has failed. According to one embodiment, the determination module  402  may determine guide information for removing or reducing a negative environmental factor that has affected an authentication operation during the authentication operation. 
     For example, the processor  400  may fail user authentication when authentication information is distorted by at least one of the illuminance information, the movement information about the electronic device, and the orientation information about the electronic device which does not satisfy a predefined condition while the authentication operation is performed. Accordingly, the determination module  402  may determine at least one piece of information which does not satisfy the predefined condition as a negative environmental factor. In another example, the processor  400  may fail user authentication when a body part (e.g., a face or an iris) used for authentication is screened by an object (e.g., glasses, sunglasses, a hat, or lenses) and thus is not recognized. Accordingly, the determination module  402  may determine the object screening the body part as a negative environmental element. In still another example, when the authentication operation is performed in a state where a biometric recognition sensor is damaged or the fingerprint sensor is stained with foreign material, authentication information for user authentication may be distorted or may not be obtained, and thus the processor  400  may fail user authentication. Accordingly, the determination module  402  may determine the state where the biometric recognition sensor is damaged or the biometric recognition sensor is stained with foreign material as a negative environmental factor. In addition, when a predefined area or less of an object to be authenticated (e.g., a body part) touches the biometric recognition sensor, when the object to be authenticated does not touch the biometric recognition sensor for a predefined period of time, or when an object to be authenticated which is stained with foreign material touches the biometric recognition sensor, authentication information for user authentication may be distorted or may not be obtained, and thus the processor  400  may fail user authentication. Accordingly, the determination module  402  may determine a state where authentication information of the predefined area or less is obtained, a state where authentication information is not recognized for the predefined period of time, or a state where authentication information including foreign material is obtained as a negative environmental factor. 
     According to various embodiments, the authentication module  404  may perform an authentication operation for user authentication. According to one embodiment, the authentication module  404  may obtain authentication information using at least one biometric recognition method. For example, the authentication module  404  may obtain authentication information using a first biometric recognition method. In addition, the authentication module  404  may obtain authentication information using a second biometric recognition method different from the first biometric recognition method. For example, the authentication module  404  may perform an authentication operation of obtaining a reference template associated with a biometric recognition method selected for authentication from among reference templates corresponding to various stored biometric recognition methods and comparing the reference template with authentication information. 
     According to various embodiments, the output control module  406  may output the authentication suitability of a biometric recognition method available for authentication. According to one embodiment, the output control module  406  may output an object corresponding to a biometric recognition method. In addition, the output control module  406  may change the attributes of an object corresponding to at least one biometric recognition method on the basis of authentication suitability. For example, the output control module  406  may change the attributes (e.g., brightness, chroma, contrast, size, or shape) of the object so that a biometric recognition method having a certain level (e.g., an authentication-possible level) of authentication suitability is distinguished from a biometric recognition method not having the certain level of authentication suitability. For example, the output control module  406  may output an object corresponding to the biometric recognition method having the certain level of authentication suitability in a highlighted manner. Further, the output control module  406  may output guide information for improving the recognition rate of at least one biometric recognition method by which user authentication has failed. 
     An electronic device according to various embodiments of the disclosure may include: a first biometric sensor configured to obtain biometric information using a first method; a second biometric sensor configured to obtain the biometric information or different biometric information using a second method; a display; and a processor. The processor may be configured to: obtain context information associated with the first method and the second method; select at least one method of the first method and the second method on the basis of at least part of the context information; and display at least one graphic object corresponding to the at least one method for authentication. 
     According to one embodiment, the processor may be configured to obtain external environment information of the electronic device using the first biometric sensor, the second biometric sensor, or a sensor capable of detecting external light of the electronic device which is functionally connected to the electronic device in at least part of an operation of obtaining the context information. For example, the external environment information of the electronic device may include illuminance information. 
     According to one embodiment, the sensor capable of detecting the external light of the electronic device may include at least one of an illumination sensor and an image sensor. 
     According to one embodiment, the processor may be configured to obtain attribute information about a function running in the electronic device in least part of an operation of obtaining the context information. 
     According to one embodiment, the processor may be configured to: identify a first success rate, at which authentication is successful with the biometric information to be obtained via the first method, and a second success rate, at which authentication is successful with the biometric information or the different biometric information to be obtained via the second method, on the basis of at least part of the context information; and change a display attribute of the at least one graphic object on the basis of at least part of the first success rate and the second success rate. 
     According to one embodiment, when at least one success rate of the first success rate and the second success rate is within a pre-specified range, the processor may be configured to display guide information for enabling the at least one success rate to satisfy a different specified range. 
     An electronic device according to various embodiments of the disclosure may include: a first biometric sensor configured to obtain biometric information using a first method; a second biometric sensor configured to obtain the biometric information or different biometric information using a second method; a display; and a processor. The processor may be configured to: obtain context information associated with the first method and the second method; identify a first success rate, at which authentication is successful with the biometric information to be obtained via the first method, and a second success rate, at which authentication is successful with the biometric information and the different biometric information to be obtained via the second method, on the basis of at least part of the context information; and display a graphic object corresponding to the first method and a graphic object corresponding to the second method on the display on the basis of at least part of the first success rate and the second success rate. 
     According to one embodiment, the processor may be configured to display guide information for enabling at least one success rate which does not satisfy a specified value among the first success rate and the second success rate to satisfy the specified value. 
     According to one embodiment, the processor may be configured to obtain context information associated with at least one of external environment information of the electronic device, movement information of the electronic device, orientation information of the electronic device, and an operation state of the first biometric sensor and the second biometric sensor. For example, the environment information may include illuminance information. 
     According to one embodiment, the processor may be configured to perform an authentication operation using the first method or the second method selected via the graphic objects. 
     According to one embodiment, the electronic device may further include a memory configured to store a first reference template associated with the first method and a second reference template associated with the second method. The processor may be configured to obtain a reference template corresponding to the selected method from the memory. 
     According to one embodiment, the processor may be configured to display notification information when the first method or the second method which does not satisfy a pre-specified success rate is used for authentication. 
     According to one embodiment, the processor may be configured to: obtain context information associated with the first method or the second method by which authentication fails; and display guide information for improving a success rate on the basis of at least part of the context information. 
     According to one embodiment, the processor may be configured to control an operation of the first biometric sensor or the second biometric sensor on the basis of at least part of the first success rate and the second success rate. 
       FIG. 5  is a flowchart illustrating a procedure for performing an authentication operation of the electronic device  101  (e.g., the processor  400 ) according to various embodiments of the disclosure. 
     Referring to  FIG. 5 , in operation  501 , the electronic device  101  (e.g., the output control module  406 ) may enter an authentication mode. According to one embodiment, the electronic device  101  may enter the authentication mode by outputting a screen for requesting an authentication operation. For example, the electronic device  101  may enter the authentication mode in a lock function-enabled state (or a lock state). 
     In operation  503 , the electronic device  101  (e.g., the determination module  402 ) may collect context information associated with a biometric recognition method (or a biometric recognition sensor) used for authentication on the basis of at least one sensor (e.g., an illumination sensor, an acceleration sensor, a geomagnetic sensor, a gyro sensor, or the like). According to one embodiment, when a plurality of biometric recognition methods (e.g., a face recognition method, an iris recognition method, a fingerprint recognition method, and the like) can be used for authentication, the electronic device  101  may collect context information associated with each biometric recognition method. For example, the electronic device  101  may collect context information associated with at least one of external illuminance information of the electronic device  101 , orientation and movement information about the electronic device  101 , and operation state information of the biometric recognition sensor. 
     In operation  505 , the electronic device  101  (e.g., the determination module  402  or the output control module  406 ) may output the authentication suitability of a biometric recognition method that can be used for authentication on the basis of the collected context information. According to one embodiment, authentication suitability may be a value indicating the degree to which a biometric recognition method is suitable to be used for user authentication. 
     For example, when it is determined that authentication information unsuitable for authentication may be obtained by at least one biometric recognition method, the electronic device  101  may determine that the authentication suitability of the at least one biometric recognition method is low. Accordingly, the electronic device  101  may output the authentication suitability of the biometric recognition method using an object indicating low authentication suitability. Further, when it is determined that authentication information suitable for authentication may be obtained by at least one biometric recognition method, the electronic device  101  may determine that the authentication suitability of the at least one biometric recognition method is high. Accordingly, the electronic device  101  may output the authentication suitability of the biometric recognition method using an object indicating high authentication suitability. In addition, the electronic device  101  may output authentication suitability in a graphic form, an audio form, a vibration form, or the like. 
     In another example, the electronic device  101  may output the authentication suitability of only at least one biometric recognition method that is determined as a method by which authentication information suitable for authentication may be obtained among biometric recognition methods that can be used for authentication. For example, the electronic device  101  may select a biometric recognition method having the highest authentication suitability and may output the authentication suitability of the selected biometric recognition method. 
       FIG. 6  is a flowchart illustrating a procedure for performing an authentication operation of the electronic device  101  (e.g., the processor  400 ) according to various embodiments of the disclosure.  FIG. 7  shows an example illustrating an authentication procedure according to various embodiments of the disclosure. According to one embodiment, the procedure for performing the authentication operation may include a detailed operation of operation  505  illustrated in  FIG. 5 . 
     According to various embodiments, the electronic device  101  may output the authentication suitability of a biometric recognition method supported by the electronic device  101  and may select a biometric recognition method to use for an authentication operation on the basis of user input. 
     Referring to  FIG. 6 , in operation  601 , the electronic device  101  (e.g., the determination module  402 ) may determine the authentication suitability of each biometric recognition method supported by the electronic device  101 . According to one embodiment, the electronic device  101  may determine the authentication suitability of an activated biometric recognition method specified by the user to be executed upon entering the authentication mode and the authentication suitability of a deactivated biometric recognition method not specified by the user. For example, the electronic device  101  may determine the authentication suitability of each biometric recognition method on the basis of at least one of external illuminance information of the electronic device  101 , a movement of the electronic device  101 , the orientation of the electronic device  101 , and an operation state of a biometric recognition sensor (e.g., whether the biometric recognition sensor is damaged). 
     In operation  603 , the electronic device  101  (e.g., the determination module  402  or the output control module  406 ) may output the authentication suitability on the basis of the determination result. According to one embodiment, the electronic device  101  may output the authentication suitability so that the user can recognize a biometric recognition method suitable for authentication and a biometric recognition method unsuitable for authentication before the authentication operation is performed. For example, the electronic device  101  may output an object corresponding to each biometric recognition method supported by the electronic device  101 . In addition, the electronic device  101  may change the attributes of the object on the basis of the authentication suitability so that a biometric recognition method having a certain level of authentication suitability is distinguished from a biometric recognition method not having the certain level of authentication suitability. Further, the electronic device  101  may change the attributes of the object so that the activated biometric recognition method is distinguished from the deactivated biometric recognition method. For example, as illustrated in  FIG. 7 , the electronic device  101  may apply ( 700 ) an effect such that a biometric recognition method having high authentication suitability (e.g., an iris recognition method  702 ) is more highlighted than a biometric recognition method having low authentication suitability (e.g., a fingerprint recognition method  704  or a face recognition method  706 ). Further, the electronic device  101  may apply a solid line effect to the activated biometric recognition method (e.g., the iris recognition method  702  and the fingerprint recognition method  704 ) to be distinguished from the deactivated biometric recognition method (e.g., the face recognition method  706 ) to which a dotted line effect is applied. According to various embodiments, the electronic device  101  may distinctively display biometric recognition methods by changing at least one of the color, contrast, shape, size, position, and transparency of the object at least on the basis of the authentication suitability. 
     In operation  605 , the electronic device  101  (e.g., the determination module  402  or the authentication module  404 ) may detect input to select a biometric recognition method. According to one embodiment, the electronic device  101  may detect input to select at least one biometric recognition method for authentication (e.g., unlocking) among the biometric recognition methods supported by the electronic device  101 . 
     In operation  607 , the electronic device  101  (e.g., the authentication module  404 ) may perform an authentication operation on the basis of the at least one selected biometric recognition method. According to one embodiment, the electronic device  101  may obtain authentication information using a biometric recognition sensor corresponding to the at least one selected biometric recognition method. For example, when an object associated with face recognition is selected from among output objects, the electronic device  101  may operate an image sensor to obtain authentication information including the face of the user. In addition, when an object associated with fingerprint recognition is selected from among the output objects, the electronic device  101  may operate a fingerprint sensor to obtain authentication information including a fingerprint of the user. Furthermore, when an object associated with iris recognition is selected from among the output objects, the electronic device  101  may operate an iris sensor to obtain authentication information including the iris of the user. For example, the electronic device  101  may perform an authentication operation of comparing authentication information obtained using a biometric recognition sensor with a stored reference template. 
       FIG. 8  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., the processor  400 ) processes authentication through a selected biometric recognition method according to various embodiments of the disclosure.  FIG. 9A  and  FIG. 9B  show examples illustrating a procedure for processing a biometric recognition method according to various embodiments of the disclosure. According to one embodiment, an operation of processing a biometric recognition method may include a detailed operation of operation  605  illustrated in  FIG. 6 . 
     According to various embodiments, with authentication suitability output, the electronic device  101  may register at least one biometric recognition method as an activated biometric recognition method. 
     Referring to  FIG. 8 , in operation  801 , the electronic device  101  (e.g., the determination module  402  or the authentication module  404 ) may determine whether an activated biometric recognition method specified by a user is selected for authentication. According to one embodiment, the electronic device  101  may determine whether to perform an authentication operation using the activated biometric recognition method specified by the user to be executed upon entering the authentication mode. 
     When the activated biometric recognition method is selected for authentication, the electronic device  101  (e.g., the authentication module  404 ) may perform an authentication operation on the basis of the selected biometric recognition method. According to one embodiment, the electronic device  101  may obtain authentication information via a biometric recognition sensor corresponding to the selected recognition method. For example, the electronic device  101  may perform an operation associated with operation  607  illustrated in  FIG. 6 . 
     When a deactivated biometric recognition method is selected for authentication, the electronic device  101  (e.g., the authentication module  404 ) may perform an operation for activating the selected biometric recognition method. According to one embodiment, in operation  803 , the electronic device  101  may perform a user authentication operation using a pre-specified activated biometric recognition method. When the user authentication operation is completed, the electronic device  101  may output a screen for activating the selected biometric recognition method in operation  805 . For example, when the deactivated biometric recognition method is selected ( 900 ) as illustrated in  FIG. 9A , the electronic device  101  may output a screen  910  for storing a reference template for the selected deactivated biometric recognition method, as illustrated in  FIG. 9B , or a screen for activating the selected deactivated biometric recognition method. 
       FIG. 10  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., the processor  400 ) performs an authentication operation on the basis of a selected biometric recognition method according to various embodiments of the disclosure.  FIG. 11  shows an example illustrating an authentication operation according to various embodiments of the disclosure. According to one embodiment, the procedure for performing the authentication operation may include a detailed operation of operation  607  illustrated in  FIG. 6 . 
     According to various embodiments, the electronic device  101  may output authentication suitability and may then perform an authentication operation on the basis of a biometric recognition method selected by a user. 
     Referring to  FIG. 10 , in operation  1001 , the electronic device  101  (e.g., the authentication module  404 ) may identify a reference template corresponding to a biometric recognition method selected for authentication. The reference template may be the result of coding (or encoding) information used for authentication (e.g., an authentication image) as reference information for the selected biometric recognition method. According to one embodiment, the electronic device  101  may obtain the reference template associated with the biometric recognition method selected for authentication from among various stored reference templates corresponding to biometric recognition methods. For example, when a first biometric recognition method (e.g., an iris recognition method) is selected for authentication, the electronic device  101  may obtain a reference template obtained by coding an iris image among the stored reference templates. Further, when a second biometric recognition method (e.g., a fingerprint recognition method) is selected for authentication, the electronic device  101  may obtain a reference template obtained by coding a fingerprint image among the stored reference templates. 
     In operation  1003 , the electronic device  101  (e.g., the authentication module  404 ) may obtain authentication information for authentication. According to one embodiment, the electronic device  101  may operate a biometric recognition sensor corresponding to the biometric recognition method selected for authentication to obtain authentication information. Further, the electronic device  101  may output a screen displaying guide information for guiding an object to be authenticated (e.g., a face, a finger, or an eye) to a predetermined position (e.g., the range of an angle of view (FOV) of the biometric recognition sensor). In another example, at least one biometric recognition sensor (e.g., a fingerprint sensor) may be embedded in a screen (e.g., a display). In this case, as illustrated in  FIG. 11 , the electronic device  101  may output guide information  1104  for guiding the object to be authenticated to a sensing area  1102  easy for authentication among sensing areas of the biometric recognition sensor included in the screen. For example, the electronic device  101  may determine at least one of an area of the sensor that is intact and an area that is not stained with foreign material as an area easy for authentication. 
     In operation  1005 , the electronic device  101  (e.g., the authentication module  404 ) may perform an authentication operation using the authentication information and the reference template. According to one embodiment, the reference template may be coded (or encoded) data. Accordingly, the electronic device  101  may generate an authentication template by coding (or encoding) the obtained authentication information. Further, the electronic device  101  may perform an authentication operation by comparing the authentication template with the reference template. 
       FIG. 12  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., the processor  400 ) performs an authentication operation on the basis of a selected biometric recognition method according to various embodiments of the disclosure.  FIG. 13  shows an example illustrating a procedure for performing an authentication operation according to various embodiments of the disclosure. According to one embodiment, the procedure for performing the authentication operation may include a detailed operation of operation  607  illustrated in  FIG. 6 . 
     According to various embodiments, the electronic device  101  may output guide information for improving the recognition rate for at least one biometric recognition sensor that has failed in user authentication. 
     Referring to  FIG. 12 , in operation  1201 , the electronic device  101  (e.g., the authentication module  404 ) may identify the result of an authentication operation. According to one embodiment, the electronic device  101  may determine whether there is a certain level of similarity between authentication information obtained by a selected biometric recognition method and a stored reference template. For example, when it is determined that the authentication information has a certain level of similarity to the reference template, the electronic device  101  may determine that authentication is successful. When it is determined that the authentication information does not have the certain level of similarity to the reference template, the electronic device  101  may determine that the authentication has failed. 
     When the authentication fails, the electronic device  101  (e.g., the determination module  402 ) may collect context information associated with a biometric recognition sensor that has performed the authentication operation in operation  1203 . According to one embodiment, the electronic device  101  may collect the context information while obtaining the authentication information via the biometric recognition sensor. 
     In operation  1205 , the electronic device  101  (e.g., the determination module  402 ) may output guide information for improving the recognition rate on the basis of the context information. According to one embodiment, the electronic device  101  may determine a negative environmental factor that has affected the biometric recognition sensor (e.g., a biometric recognition sensor used for authentication) and may output guide information on the basis of the determination result. For example, the electronic device  101  may define guide information corresponding to a negative environmental factor as shown in Table 1. 
     
       
         
           
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 Environmental factor 
                 Guide information 
               
               
                   
               
             
            
               
                 Illuminance above reference value 
                 Move to the dark 
               
               
                 Illuminance below reference value 
                 Move to the light 
               
               
                 Orientation of electronic device out of 
                 Move electronic device toward 
               
               
                 reference value 
                 face 
               
               
                 Foreign material (or moisture) 
                 Remove foreign material on 
               
               
                   
                 sensor or body part 
               
               
                 Noise above reference value 
                 Remove noise 
               
               
                 Noise below reference value 
                 Remove vibrations 
               
               
                   
               
            
           
         
       
     
     For example, when it is determined that authentication information unsuitable for authentication is obtained due to ambient illuminance, the electronic device  101  may output guide information indicating a move to a place brighter or darker than a current brightness. When it is determined that authentication information unsuitable for authentication is obtained due to the presence of foreign material on an object or the biometric recognition sensor, as illustrated in  FIG. 13 , the electronic device  101  may output ( 1300 ) guide information indicating removal of foreign material. 
     When the authentication is successful, the electronic device  101  (e.g., the processor  400 ) may release a lock function in operation  1207 . 
       FIG. 14  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., processor  400 ) performs an authentication operation for an application according to various embodiments of the disclosure.  FIG. 15A  and  FIG. 15B  show examples illustrating a procedure for performing an authentication operation according to various embodiments of the disclosure. According to one embodiment, the procedure for performing the authentication operation may include a detailed operation of operation  1207  illustrated in  FIG. 12 . 
     According to various embodiments, the electronic device  101  may recommend a biometric recognition method on the basis of the characteristics of an application when user authentication is required during execution of the application. 
     Referring to  FIG. 14 , in operation  1401 , the electronic device  101  (e.g., the processor  400 ) may execute at least one application in a state where a lock function is released (e.g., an unlocked state). Further, the electronic device  101  may determine whether user authentication is required upon execution of the application or during execution of the application. According to one embodiment, the electronic device  101  may determine whether a screen accessible only by an authenticated user (e.g., a payment screen or a personal information input screen) is output when the application is executed. 
     When authentication is not required, the electronic device  101  (e.g., the processor  400 ) may remain locked. According to one embodiment, the electronic device  101  may maintain execution of the application. 
     When authentication is required, the electronic device  101  (e.g., the processor  400 , the determination module  402 , or the output control module  406 ) may recommend a biometric recognition method on the basis of the security level of the executed application in operation  1403 . According to one embodiment, as illustrated in  FIG. 15A , when an application (e.g., a web browser) having a first security level (e.g., a low security level) is executed, the electronic device  101  may recommend ( 1500 ) a biometric recognition method (e.g., an iris recognition method  1502 , a fingerprint recognition method  1504 , and a face recognition method  1506 ) corresponding to a first group as an authentication method. For example, the biometric recognition method corresponding to the first group may be any biometric recognition method supported by the electronic device  101 . As illustrated in  FIG. 15B , an application (e.g., a banking application) having a second security level (e.g., a high security level) is executed, the electronic device  101  may recommend ( 1510 ) a biometric recognition method (e.g., an iris recognition method  1512  or a fingerprint recognition method  1514 ) corresponding to a second group as an authentication method. For example, the biometric recognition method corresponding to the second group may include a biometric recognition method having a certain security level. For example, the electronic device  101  may provide the biometric recognition method corresponding to the second group excluding a biometric recognition method (e.g., a face recognition method) having a security level lower than the certain level as a recommended authentication method. 
     In operation  1405 , the electronic device  101  (e.g., the determination module  402  or the authentication module  404 ) may detect input to select a biometric recognition method. According to one embodiment, the electronic device  101  may detect input to select at least one biometric recognition method for authentication (e.g., unlocking) among recommended authentication methods. 
     In operation  1407 , the electronic device  101  (e.g., the authentication module  404 ) may perform an authentication operation on the basis of at least one selected biometric recognition method. According to one embodiment, the electronic device  101  may obtain authentication information using a biometric recognition sensor corresponding to the at least one selected biometric recognition method. Further, the electronic device  101  may perform an authentication operation of comparing the authentication information obtained using the biometric recognition sensor with a stored reference template. 
       FIG. 16  is a flowchart illustrating a procedure for performing an authentication operation of an electronic device  101  (e.g., the processor  400 ) according to various embodiments of the disclosure.  FIG. 17  shows an example illustrating a procedure for performing an authentication operation according to various embodiments of the disclosure. According to one embodiment, the procedure for performing the authentication operation may include a detailed operation of operation  505  illustrated in  FIG. 5 . 
     According to various embodiments, the electronic device  101  may output the authentication suitability of a pre-specified activated biometric recognition method and may select a biometric recognition method to use for an authentication operation on the basis of user input. 
     Referring to  FIG. 16 , in operation  1601 , the electronic device  101  (e.g., the determination module  402 ) may determine the authentication suitability of a pre-specified activated biometric recognition method. According to one embodiment, the electronic device  101  may determine the authentication suitability on the basis of context information associated with the pre-specified activated biometric recognition method. For example, operation  1601  is different from operation  601  of  FIG. 6  in that the authentication suitability of a deactivated biometric recognition method is not determined. 
     In operation  1603 , the electronic device  101  (e.g., the output control module  406 ) may output the authentication suitability of the activated biometric recognition method. According to one embodiment, the electronic device  101  may output the authentication suitability so that a user can recognize an activated biometric recognition method suitable for authentication and an activated biometric recognition method unsuitable for authentication before an authentication operation is performed. For example, the electronic device  101  may output an object corresponding to the activated biometric recognition method. In addition, the electronic device  101  may distinguish a biometric recognition method having a certain level of authentication suitability from a biometric recognition method not having the certain level of authentication suitability on the basis of the authentication suitability. For example, as illustrated in  FIG. 17 , the electronic device  101  may apply authentication suitability to each activated biometric recognition method, thereby distinguishing an activated biometric recognition method having high authentication suitability (e.g., an iris recognition method  1702  or a fingerprint authentication method  1704 ) from a biometric recognition method having low authentication suitability (e.g., a face recognition method  1706 ) ( 1700 ). 
     In operation  1605 , the electronic device  101  (e.g., the processor  400  or the determination module  402 ) may detect input to select a biometric recognition method. According to one embodiment, the electronic device  101  may determine a biometric recognition method to use for authentication among activated biometric recognition methods on the basis of the input. 
     In operation  1607 , the electronic device  101  (e.g., the authentication module  404 ) may perform an authentication operation on the basis of the selected biometric recognition method. 
       FIG. 18  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., the processor  400 ) outputs authentication suitability according to various embodiments of the disclosure.  FIG. 19  shows an example illustrating a procedure for outputting authentication suitability according to various embodiments of the disclosure. According to one embodiment, the procedure for outputting the authentication suitability may include a detailed operation of operation  1603  illustrated in  FIG. 16 . 
     According to various embodiments, the electronic device  101  may provide guide information for improving authentication suitability for a biometric recognition method by which unsuitable authentication information may be obtained. 
     Referring to  FIG. 18 , in operation  1801 , the electronic device  101  (e.g., the determination module  402 ) may determine whether there is an activated biometric recognition method having an authentication suitability less than a reference value among activated biometric recognition methods on the basis of authentication suitability. According to one embodiment, the electronic device  101  may determine whether there is a biometric recognition method by which unsuitable authentication information may be obtained among the activated biometric recognition methods. 
     When it is determined that there is no activated biometric recognition method having an authentication suitability less than the reference value, the electronic device  101  (e.g., the output control module  406 ) may perform an operation of outputting the authentication suitability of an activated biometric recognition method. According to one embodiment, the electronic device  101  may perform an operation associated with operation  1603  illustrated in  FIG. 16 . 
     When it is determined that there is an activated biometric recognition method having an authentication suitability less than the reference value, the electronic device  101  (e.g., the output control module  406 ) may output guide information for improving authentication suitability in operation  1803 . According to one embodiment, the electronic device  101  may determine a negative environmental factor that affects the biometric recognition method and may output guide information on the basis of the determination result. For example, the electronic device  101  may output guide information for reducing a negative environmental factor for a biometric recognition method by which unsuitable authentication information may be obtained. For example, the electronic device  101  may determine, on the basis of at least one sensor, that the external illuminance of the electronic device  101  (e.g., illuminance less than a reference brightness) affects a biometric recognition method. Accordingly, as illustrated in  FIG. 19 , the electronic device  101  may output ( 1900 ) guide information  1902  for inducing an illuminance change in order to improve authentication suitability. 
       FIG. 20  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., the processor  400 ) outputs guide information for improving authentication suitability according to various embodiments of the disclosure. According to one embodiment, the procedure for outputting the guide information may include a detailed operation of operation  1803  illustrated in  FIG. 18 . 
     According to various embodiments, the electronic device  101  may control the operation of the electronic device  101  in connection with a biometric recognition method that is not improved in authentication suitability. According to one embodiment, the electronic device  101  may control the operation of a biometric recognition sensor associated with a biometric recognition method that is not improved in authentication suitability, thereby reducing battery consumption. 
     Referring to  FIG. 20 , in operation  2001 , with guide information for improving authentication suitability output, the electronic device  101  (e.g., the determination module  402 ) may collect context information associated with a biometric recognition method by which unsuitable authentication information may be obtained on the basis of at least one sensor. According to one embodiment, the electronic device  101  may re-determine the authentication suitability of the biometric recognition method determined as a method by which unsuitable authentication information may be obtained on the basis of the collected context information. 
     In operation  2003 , the electronic device  101  (e.g., the determination module  402 ) may determine whether the authentication suitability of the biometric recognition method determined as a method by which unsuitable authentication information may be obtained is changed. According to one embodiment, the electronic device  101  may determine whether the authentication suitability of the biometric recognition method determined as a method by which unsuitable authentication information may be obtained is improved. 
     When the authentication suitability is changed, the electronic device  101  (e.g., the output control module  406 ) may determine that the authentication suitability is improved and may output the changed authentication suitability in operation  2007 . According to one embodiment, the electronic device  101  may change the biometric recognition method determined as a method by which unsuitable authentication information may be obtained to an activated biometric recognition method having high authentication suitability. 
     When the authentication suitability is not changed, the electronic device  101  (e.g., the processor  400 ) may determine that the authentication suitability is not improved and may control the operation of a biometric recognition sensor associated with the biometric recognition method determined as a method by which unsuitable authentication information may be obtained in operation  2005 . According to one embodiment, the electronic device  101  may change the operation cycle of the biometric recognition sensor or may stop the operation of the biometric recognition sensor. For example, the electronic device  101  may control the operation of the biometric recognition sensor, thereby reducing battery consumption. 
       FIG. 21  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., the processor  400 ) determines a biometric recognition method to use for authentication according to various embodiments of the disclosure.  FIG. 22A  and  FIG. 22B  show examples illustrating a procedure for changing a biometric recognition method according to various embodiments of the disclosure. According to one embodiment, the procedure for determining the biometric recognition method to use for authentication may include a detailed operation of operation  1605  illustrated in  FIG. 16 . 
     According to various embodiments, the electronic device  101  may predict the authentication accuracy of a biometric recognition method selected for authentication. 
     Referring to  FIG. 21 , in operation  2101 , the electronic device  101  (e.g., the determination module  402 ) may determine whether a biometric recognition method by which unsuitable authentication information may be obtained is selected for authentication. According to one embodiment, the electronic device  101  may determine whether a biometric recognition method having an authentication suitability less than a reference value is selected for authentication. 
     When a biometric recognition method by which suitable authentication information can be obtained is selected, the electronic device  101  (e.g., the authentication module  404 ) may perform an authentication operation on the basis of the selected biometric recognition method. According to one embodiment, the electronic device  101  may perform an operation associated with operation  1607  illustrated in  FIG. 16 . 
     When a biometric recognition method by which unsuitable authentication information may be obtained is selected, the electronic device  101  (e.g., the output control module  406 ) may indicate that an inaccurate authentication result may be produced by the selected biometric recognition method in operation  2103 . According to one embodiment, when a biometric recognition method by which unsuitable authentication information may be obtained ( 2201 ) due to external illuminance (e.g., illuminance less than a reference brightness) as illustrated in  FIG. 22A , the electronic device may output guide information  2203  indicating that unsuitable authentication information may be produced due to external illuminance as illustrated in  FIG. 22B . Further, when a new biometric recognition method is selected after indicating that an inaccurate authentication result may be produced, the electronic device  101  may perform an authentication operation using the selected biometric recognition method. When a new biometric recognition method is not selected, the electronic device  101  may perform an authentication operation using an already selected biometric recognition method. 
       FIG. 23  is a flowchart illustrating another procedure for performing an authentication operation of the electronic device  101  (e.g., the processor  400 ) according to various embodiments of the disclosure.  FIG. 25A  and  FIG. 25B  show examples illustrating an authentication operation according to various embodiments of the disclosure. 
     Referring to  FIG. 23 , in operation  501 , the electronic device  101  (e.g., the output control module  406 ) may enter an authentication mode. According to one embodiment, the electronic device  101  may enter the authentication mode by outputting a screen for requesting an authentication operation. For example, the electronic device  101  may enter the authentication mode on the basis of user input (e.g., wake-up input) in a lock function-enabled state (sleep state or lock state). 
     In operation  2303 , the electronic device  101  (e.g., the determination module  402 ) may collect context information associated with a biometric recognition method (or biometric recognition sensor) used for authentication on the basis of at least one sensor. According to one embodiment, when a plurality of biometric recognition methods (e.g., a face recognition method, an iris recognition method, a fingerprint recognition method, and the like) may be used for authentication, the electronic device  101  may collect context information associated with each biometric recognition method. For example, the electronic device  101  may collect context information associated with at least one of external illuminance information of the electronic device  101 , orientation and movement information about the electronic device  101 , and operation state information of the biometric recognition sensor. 
     In operation  2305 , the electronic device  101  (e.g., the determination module  402 ) may determine the authentication suitability of a biometric recognition method that can be used for authentication on the basis of the collected context information. According to one embodiment, authentication suitability may be a value indicating the degree to which a biometric recognition method is suitable to be used for user authentication. 
     In operation  2307 , the electronic device  101  (e.g., the output control module  406 ) may output at least one biometric recognition method that can be used for authentication. According to one embodiment, the electronic device  101  may output a screen displaying an object corresponding to the at least one biometric recognition method that can be for authentication. For example, as illustrated in  FIG. 25A , the electronic device  101  may output an object  2501  corresponding to an iris recognition method available for authentication, an object  2503  corresponding to a fingerprint recognition method, or an object  2505  corresponding to a face recognition method. 
     In operation  2309 , the electronic device  101  (e.g., the determination module  402  or the processor  400 ) may detect input to select a biometric recognition method to use for authentication. According to one embodiment, the electronic device  101  may detect input to select one of the objects output on the screen. 
     In operation  2311 , the electronic device  101  (e.g., the output control module  402 ) may output the authentication suitability of a selected biometric recognition method. According to one embodiment, when input  2510  to select the object corresponding to the iris recognition method among the output objects is detected as illustrated in  FIG. 25A , the electronic device  101  may output the authentication suitability  2512  corresponding to the object selected by the user on the screen as illustrated in  FIG. 25B . 
     In operation  2313 , the electronic device  101  (e.g., the processor  400  or the determination module  402 ) may identify detected input while outputting the authentication suitability of the selected biometric recognition method. According to one embodiment, the input may include input to select another biometric recognition method for performing an authentication operation. The input may also include input to perform an authentication operation using the selected biometric recognition method. 
     Upon detecting the input to perform the authentication operation using the selected biometric recognition method, the electronic device  101  (e.g., the authentication module  404 ) may perform an authentication operation on the basis of the selected biometric recognition method in operation  2315 . 
       FIG. 24  is a flowchart illustrating a procedure in which the electronic device  101  (e.g., the processor  400 ) detects user input while outputting authentication suitability according to various embodiments of the disclosure.  FIG. 25B  and  FIG. 25C  show examples illustrating an authentication operation according to various embodiments of the disclosure. According to one embodiment, the procedure for detecting the user input may include a detailed operation of operation  2311  illustrated in  FIG. 23 . 
     In operation  2401 , the electronic device  101  (e.g., the processor  400  or the determination module  402 ) may determine whether input to select a different biometric recognition method is detected. According to one embodiment, the electronic device  101  may determine whether input to request the authentication suitability of a different biometric recognition method is detected. 
     When input to select a different biometric recognition method is detected, the electronic device  101  (e.g., the output control module  406 ) may output the authentication suitability of the different biometric recognition method in operation  2403 . According to one embodiment, upon detecting input  2520  to change a biometric recognition method as illustrated in  FIG. 25B , the electronic device  101  may output the authentication suitability  2522  of a changed biometric recognition method as illustrated in  FIG. 25C . In addition, upon detecting input  2523  to perform an authentication operation using a different selected biometric recognition method, the electronic device  101  may perform an authentication operation accordingly. 
     An operating method of an electronic device according to various embodiments of the disclosure may include: obtaining context information associated with a first biometric recognition method and a second biometric recognition method; identifying a first success rate, at which authentication is successful with biometric information to be obtained via the first biometric recognition method, and a second success rate, at which authentication is successful with biometric information to be obtained via the second biometric recognition method, on the basis of at least part of the context information; and displaying a graphic object corresponding to the first method and a graphic object corresponding to the second method on the basis of at least part of the first success rate and the second success rate. 
     According to one embodiment, the displaying of the graphic object may include displaying guide information for enabling at least one success rate which does not satisfy a specified value among the first success rate and the second success rate to satisfy the specified value. 
     According to one embodiment, the context information may be associated with at least one of external environment information of the electronic device, movement information of the electronic device, orientation information of the electronic device, and an operation state of the first biometric sensor and the second biometric sensor. For example, the environment information may include illuminance information. 
     According to one embodiment, the operating method may further include authenticating a user using the first method or the second method selected via the graphic objects. 
     According to one embodiment, the authenticating of the user may include: storing a first reference template associated with the first method and a second reference template associated with the second method; and obtaining a reference template corresponding to the selected method from among the stored reference templates. 
     According to one embodiment, the authenticating of the user may include displaying notification information when the first method or the second method which does not satisfy a specified success rate is used for authentication. 
     According to one embodiment, the authenticating of the user may include: obtaining context information associated with the first method or the second method by which authentication fails; and displaying guide information for improving a success rate on the basis of at least part of the context information. 
     An electronic device and an operating method thereof according to various embodiments of the disclosure may provide the recognition rate of a biometric recognition method on the basis of context information or may recommend a biometric recognition suitable for an authentication operation, thereby improving the user recognition rate of the electronic device. 
     Various embodiments disclosed herein are provided merely to easily describe technical details of the disclosure and to help the understanding of the disclosure, and are not intended to limit the scope of the disclosure. Therefore, it should be construed that all modifications and changes or modified and changed forms based on the technical idea of the disclosure fall within the scope of the disclosure.