Patent Publication Number: US-10310807-B2

Title: Electronic device, method of controlling volume of the electronic device, and method of controlling the electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This is a continuation application of U.S. application Ser. No. 14/827,572 filed on Aug. 17, 2015, which claims priority from Korean Patent Application No. 10-2014-0138621, filed on Oct. 14, 2014, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety. 
    
    
     BACKGROUND 
     1. Field 
     Apparatuses and methods consistent with exemplary embodiments relate to an electronic device and a method of automatically adjusting volume of the electronic device. 
     2. Description of the Related Art 
     A telephone ring or vibratory sound of a mobile phone may not be heard due to an audio signal output from other media reproducing apparatus, such as a television (TV), while content is being reproduced by the media reproducing apparatus, and also, even while a user is talking on the mobile phone, reception sound of the mobile phone may not be heard well due to the volume of the audio signal output from the media reproducing apparatus. At this time, the user has to adjust the volume of the audio signal output from the media reproducing apparatus by using a remote controller or the like. Also, if the user does not hear the telephone ring or vibratory sound and does not personally adjust the volume of the audio signal, the user may be unable to answer the mobile phone. 
     SUMMARY 
     One or more exemplary embodiments provide an electronic device for automatically adjusting volume of an audio signal output from the electronic device, and a method of adjusting volume of the electronic device. 
     One or more exemplary embodiments provide a mobile terminal capable of controlling an electronic device to automatically adjust volume of an audio signal output from the electronic device, and a method of controlling, by the mobile terminal, the electronic device. 
     According to an aspect of an exemplary embodiment, there is provided a method of adjusting volume of an audio signal output from an electronic device, the method including: connecting the electronic device and at least one mobile terminal; receiving at least one of setting information regarding adjusting of the volume of the audio signal and usage history information of the at least one mobile terminal; receiving event generation information from the at least one mobile terminal; determining a volume adjusting operation to be performed on the audio signal based on the at least one of the setting information and the usage history information, and the event generation information; and adjusting the volume of the audio signal according to the volume adjusting operation. 
     The event generation information may include at least one of a call reception notification, a message reception notification, and a notification from an application installed in at least one mobile terminal. 
     The setting information may include at least one of general volume adjusting information and individual volume adjusting information regarding the at least one mobile terminal. 
     The general volume adjusting information may include an adjustment level of the volume of the audio signal when the event generation information is received regardless of a type of the at least one mobile terminal. 
     The individual volume adjusting information may include at least one of information about whether to apply a situational automatic volume adjusting operation and a situational adjustment level. The individual volume adjusting information may include at least one of adjusting information per user, adjusting information per program, adjusting information per channel, adjusting information per program genre, adjusting information per timeslot, and adjusting information per transmitter. 
     The at least one mobile terminal may include a plurality of mobile terminals, and the adjusting information per user may include priority information about the volume adjusting operation with respect to a plurality of users respectively using the plurality of mobile terminals. 
     The determining of the volume adjusting operation may include, when the event generation information is received, determining to adjust the volume of the audio signal to a first user level for a first user having a higher priority and adjust the volume of the audio signal to a second user level lower than the first user level for a second user having a lower priority, based on the adjusting information per user. 
     The usage history information may include at least one of a call history list, a missed call list, a blocked call list, a contact list, and a favorites list of the at least one mobile terminal. 
     The determining of the volume adjusting operation may include: when the event generation information is received, storing the volume of the audio signal at a point of time when the event generation information is received as a first level; and adjusting the volume of the audio signal to a second level according to at least one of the setting information and the usage history information. 
     The adjusting of the volume may include: comparing the first level and the second level; when the first level is higher than the second level, changing the volume of the audio signal from the first level to the second level; and when the first level is lower than or equal to the second level, maintaining the volume of the audio signal at the first level. 
     The method may further include: receiving event termination information from the at least one mobile terminal; and re-adjusting the volume of the audio signal to the first level according to the event termination information. 
     The method may further include: receiving forced termination information commanding to terminate the volume adjusting operation; and re-adjusting the volume of the audio signal to the first level according to the forced termination information. 
     The method may further include, when a first time that has passed after the volume of the audio signal is adjusted to the second level is equal to or higher than a threshold time, re-adjusting the volume of the audio signal to the first level. 
     The method may further include displaying the event generation information based on at least one of the setting information and the usage history information. 
     The method may further include receiving a user input commanding to perform the volume adjusting operation according to the displayed event generation information, wherein the determining of the volume adjusting operation may include determining the volume adjusting operation according to the received user input. 
     The receiving of the event generation information may include receiving the event generation information and at least one of identification (ID) information of the at least one mobile terminal and transmitter information from the at least one mobile terminal, and the displaying of the event generation information may further include displaying the at least one of the ID information and the transmitter information. 
     The ID information may include at least one of a phone number of the at least one mobile terminal, an address assigned to the at least one mobile terminal, a name of a user using the at least one mobile terminal, and a nickname of the user, and the transmitter information may include at least one of a phone number of the transmitter, a photo, a name, and a nickname of the transmitter, which are stored in the at least one mobile terminal. 
     The method may further include: receiving a user input commanding to continue the volume adjusting operation according to the displayed event generation information; and re-adjusting the volume of the audio signal according to the received user input. 
     The connecting may include: receiving ID information from the at least one mobile terminal; and registering the at least one mobile terminal in a connection terminal list by storing the received ID information. 
     The ID information may include at least one of a phone number of the at least one mobile terminal, an address assigned to the at least one mobile terminal, a name of a user using the at least one mobile terminal, and a nickname of the user. 
     The determining of the volume adjusting operation may include, when the event generation information is received from a mobile terminal that is not registered in the connection terminal list, determining to adjust the volume of the audio signal to a standard level. 
     The adjusting of the volume may include: comparing a first level, which is the volume of the audio signal at a point of time when the event generation information is received, with the standard level; when the first level is higher than the standard level, changing the volume of the audio signal from the first level to the standard level; and when the first level is lower than or equal to the standard level, maintaining the volume of the audio signal at the first level. 
     The method may further include estimating a distance between the electronic device and the at least one mobile terminal, wherein the determining of the volume adjusting operation may include determining the volume adjusting operation to be performed on the audio signal based on at least one of the setting information and the usage history, the event generation information, and the estimated distance. 
     The connecting of the electronic device and the at least one mobile terminal may include connecting the electronic device and the at least one mobile terminal via Bluetooth or Wi-Fi. 
     According to an aspect of another exemplary embodiment, there is provided a method of controlling, by a mobile terminal, at least one electronic device to adjust volume of an audio signal output from the at least one electronic device, the method including: when an event is generated, determining a volume adjusting operation to be performed on the audio signal based on usage history information of the mobile terminal; connecting the mobile terminal and the at least one electronic device; and transmitting information about the volume adjusting operation and event generation information to the at least one electronic device. 
     The event generation information may include at least one of a call reception notification, a message reception notification, and a notification from an application installed in the mobile terminal. 
     The usage history information may include at least one of a call history list, a missed call list, a blocked call list, a contact list, and a favorites list of the mobile terminal. 
     The method may further include transmitting at least one of identification (ID) information of the mobile terminal and transmitter information to the at least one electronic device. 
     The ID information may include at least one of a phone number of the mobile terminal, an address assigned to the mobile terminal, a name of a user using the mobile terminal, and a nickname of the user. 
     The method may further include transmitting at least one of event termination information and information commanding to re-adjust the volume of the audio signal to the at least one electronic device. 
     The method may further include receiving setting information regarding adjusting of the volume of the audio signal, wherein the determining of the volume adjusting operation may include determining the volume adjusting operation based on at least one of the usage history information and the setting information. 
     The setting information may include at least one of general volume adjusting information and individual volume adjusting information. 
     According to an aspect of another exemplary embodiment, there is provided a method of controlling, by a server, at least one electronic device to adjust volume of an audio signal output from the at least one electronic device, the method including: receiving at least one of setting information regarding adjusting of the volume of the audio signal and usage history information of at least one mobile terminal; receiving event generation information from the at least one mobile terminal; determining a volume adjusting operation to be performed on the audio signal based on at least one of the setting information and the usage history information, and the event generation information; and transmitting information about the volume adjusting operation to the at least one electronic device. 
     According to an aspect of another exemplary embodiment, there is provided an electronic device including: a communication unit that receives event generation information from at least one mobile terminal by communicating with the at least one mobile terminal; a user input unit that receives setting information regarding adjusting of volume of an audio signal; and a controller that determines a volume adjusting operation to be performed on the audio signal based on the setting information and the event generation information; and an audio output unit that outputs the audio signal according to the volume adjusting operation. 
     The communication unit may further receive usage history information from the at least one mobile terminal, and when the event generation information is received, the controller may determine the volume adjusting operation based on the setting information and the usage history information. 
     When the event generation information is received, the controller may store the volume of the audio signal at a point of time when the event generation information is received as a first level and adjusts the volume of the audio signal to a second level according to the setting information. 
     The controller may re-adjust the volume of the audio signal to the first level when event termination information is received from the at least one mobile terminal or forced termination information is received from a user. 
     The controller may re-adjust the volume of the audio signal to the first level when a first time that has passed after the volume of the audio signal is adjusted to the second level is equal to or higher than a threshold time. 
     The electronic device may further include a display unit that displays the event generation information. 
     The user input unit may further receive a user input commanding to perform the volume adjusting operation according to the event generation information, and the controller may determine the volume adjusting operation based on the setting information, the event generation information, and the user input. 
     The communication unit may further receive identification (ID) information of the at least one mobile terminal and transmitter information from the at least one mobile terminal, and the display unit may display at least one of the ID information and the transmitter information, and the event generation information. 
     The communication unit may register the at least one mobile terminal in a connection terminal list by receiving ID information from the at least one mobile terminal and storing the received ID information. 
     When the event generation information is received from a mobile terminal that is not registered in the connection terminal list, the controller may adjust the volume of the audio signal to a standard level. 
     According to an aspect of another exemplary embodiment, there is provided a mobile terminal which controls at least one electronic device to adjust volume of an audio signal output from the at least one electronic device, the mobile terminal including: a controller that determines a volume adjusting operation to be performed on the audio signal based on usage history information of the mobile terminal when an event is generated; and a communication unit that transmits information about the volume adjusting operation and event generation information to the at least one electronic device. 
     The mobile terminal may further include a user input unit that receives setting information regarding adjusting of the volume of the audio signal, wherein, when the event is generated, the controller may determine the volume adjusting operation based on at least one of the usage history information and the setting information. 
     The communication unit may further transmit at least one of identification (ID) information of the mobile terminal, the usage history information, and event termination information. 
     According to one or more exemplary embodiments, a non-transitory computer-readable recording medium has recorded thereon a program, which when executed by a computer, performs the method of adjusting the volume of the audio signal. 
     According to one or more exemplary embodiments, a non-transitory computer-readable recording medium has recorded thereon a program, which when executed by a computer, performs the method of controlling the electronic device. 
     According to an aspect of another exemplary embodiment, there is provided a method of adjusting volume of an audio signal output from an electronic device, the method including: connecting the electronic device and a mobile terminal; receiving, by the electronic device, at least one of setting information regarding adjusting of the volume of the audio signal and usage history information of the mobile terminal; receiving, by the electronic device, event generation information from the mobile terminal; determining, by the electronic device, a volume adjusting operation to be performed on the audio signal based on the at least one of the setting information and the usage history information, and the event generation information; and adjusting the volume of the audio signal according to the volume adjusting operation. 
     The event generation information may include at least one of a call reception notification, a message reception notification, and a notification from an application installed in the mobile terminal. 
     The setting information may include at least one of general volume adjusting information and individual volume adjusting information. 
     The general volume adjusting information may include information regarding an adjustment level of the volume of the audio signal in response to the electronic device receiving the event generation information regardless of a type of the mobile terminal. 
     The individual volume adjusting information may include at least one of information about whether to apply the volume adjusting operation and a situational adjustment level to be applied in the volume adjusting operation. 
     The individual volume adjusting information may include at least one of adjusting information per user of the mobile device, adjusting information per program of the electronic device, adjusting information per channel of the electronic device, adjusting information per program genre of the electronic device, adjusting information per timeslot, and adjusting information per transmitter. 
     The mobile terminal may include a plurality of mobile terminals, and the adjusting information per user may include priority information with respect to a plurality of users respectively using the plurality of mobile terminals and the volume adjusting operation based on the priority information. 
     The determining the volume adjusting operation may include, in response to the event generation information being received, determining priority amongst the plurality of users based on the priority information of the adjusting information per user and adjusting the volume of the audio signal to a first user level corresponding to an adjustment level for a first user having a higher priority than remaining users of the plurality of users. 
     The usage history information may include at least one of a call history list, a missed call list, a blocked call list, a contact list, and a favorites list of the mobile terminal. 
     The determining the volume adjusting operation may include: in response to the event generation information being received, storing the volume of the audio signal at a point of time when the event generation information is received as a first level; and setting the volume of the audio signal to be adjusted to as a second level according to at least one of the setting information and the usage history information. 
     The adjusting of the volume may include: comparing the first level and the second level; in response to the first level being higher than the second level, changing the volume of the audio signal from the first level to the second level; and in response to the first level being lower than or equal to the second level, maintaining the volume of the audio signal at the first level. 
     The method may further include: receiving event termination information from the mobile terminal; and re-adjusting the volume of the audio signal to the first level in response to receiving the event termination information. 
     The method may further include: receiving forced termination information commanding to terminate the volume adjusting operation; and re-adjusting the volume of the audio signal to the first level in response to receiving the forced termination information. 
     The method may further include, in response to a duration of time that has passed after the volume of the audio signal is adjusted to the second level from the first level being greater than or equal to a threshold time, re-adjusting the volume of the audio signal to the first level. 
     The method may further include displaying the event generation information, by the electronic device, based on at least one of the setting information and the usage history information. 
     The method may further include receiving, by the electronic device, a user input commanding to perform the volume adjusting operation based on the displayed event generation information, wherein the determining the volume adjusting operation may include determining the volume adjusting operation according to the received user input. 
     The receiving the event generation information may include receiving the event generation information and at least one of identification (ID) information of the mobile terminal and transmitter information from the mobile terminal, and the displaying the event generation information may further include displaying, by the electronic device, the at least one of the ID information and the transmitter information. 
     The ID information may include at least one of a phone number of the mobile terminal, an address assigned to the mobile terminal, a name of a user using the mobile terminal, and a nickname of the user, and the transmitter information may include at least one of a phone number of the transmitter, a photo, a name, and a nickname of the transmitter, which are stored in the mobile terminal. 
     The method may further include: receiving a user input commanding to perform the volume adjusting operation according to the displayed event generation information; and adjusting the volume of the audio signal according to the received user input. 
     The connecting may include: receiving, by the electronic device, ID information from the mobile terminal; and registering, by the electronic device, the mobile terminal in a connection terminal list by storing the received ID information. 
     The ID information may include at least one of a phone number of the mobile terminal, an address assigned to the mobile terminal, a name of a user using the mobile terminal, and a nickname of the user. 
     The determining the volume adjusting operation may include, in response to the event generation information being received from a mobile terminal that is not registered in the connection terminal list, determining to adjust the volume of the audio signal to a standard level. 
     The adjusting of the volume may include: comparing a first level, which is the volume of the audio signal at a point of time when the event generation information is received by the electronic device, with the standard level; in response to the first level being higher than the standard level, changing the volume of the audio signal from the first level to the standard level; and in response to the first level being lower than or equal to the standard level, maintaining the volume of the audio signal at the first level. 
     The method may further include estimating a distance between the electronic device and the mobile terminal, wherein the determining the volume adjusting operation may include determining the volume adjusting operation to be performed on the audio signal based on at least one of the setting information and the usage history, the event generation information, and the estimated distance. 
     The connecting the electronic device and the mobile terminal may include connecting the electronic device and the mobile terminal via Bluetooth or Wi-Fi. 
     According to an aspect of another exemplary embodiment, there is provided a method of controlling, by a mobile terminal, an electronic device to adjust volume of an audio signal output from the electronic device, the method including: in response to an event occurring in the mobile terminal, determining a volume adjusting operation to be performed on the audio signal of the electronic device based on usage history information of the mobile terminal; connecting the mobile terminal and the electronic device; and transmitting information about the volume adjusting operation and event generation information to the electronic device. 
     The event generation information may include at least one of a call reception notification in the mobile terminal, a message reception notification in the mobile terminal, and a notification from an application installed in the mobile terminal. 
     The usage history information may include at least one of a call history list, a missed call list, a blocked call list, a contact list, and a favorites list of the mobile terminal. 
     The method may further include transmitting at least one of identification (ID) information of the mobile terminal and transmitter information to the electronic device. 
     The ID information may include at least one of a phone number of the mobile terminal, an address assigned to the mobile terminal, a name of a user using the mobile terminal, and a nickname of the user. 
     The method may further include transmitting at least one of event termination information and information commanding to re-adjust the volume of the audio signal to the electronic device. 
     The method may further include receiving setting information regarding adjusting of the volume of the audio signal, wherein the determining the volume adjusting operation may include determining the volume adjusting operation based on at least one of the usage history information and the setting information. 
     The setting information may include at least one of general volume adjusting information and individual volume adjusting information. 
     According to an aspect of another exemplary embodiment, there is provided a method of controlling, by a server, an electronic device to adjust volume of an audio signal output from the electronic device, the method including: receiving, by the server, at least one of setting information regarding adjusting of the volume of the audio signal and usage history information of a mobile terminal; receiving, by the server, event generation information from the mobile terminal; determining, by the server, a volume adjusting operation to be performed on the audio signal to be output from the electronic device based on at least one of the setting information and the usage history information, and the event generation information; and transmitting, by the server, information about the volume adjusting operation to the electronic device. 
     According to an aspect of another exemplary embodiment, there is provided an electronic device including: a communicator configured to be in communication with a mobile terminal and to receive event generation information from the mobile terminal; a user input receiver configured to receive setting information regarding adjusting of volume of an audio signal of the electronic device; and a controller configured to determine a volume adjusting operation to be performed on the audio signal based on the setting information and the event generation information; and an audio outputter configured to output the audio signal according to the volume adjusting operation. 
     The communicator may further be configured to receive usage history information from the mobile terminal, and in response to the event generation information being received by the electronic device, the controller is configured to determine the volume adjusting operation based on the setting information and the usage history information. 
     In response to the event generation information being received, the controller is configured to store the volume of the audio signal at a point of time when the event generation information is received as a first level and configured to adjust the volume of the audio signal to a second level according to the setting information. 
     The controller may be configured to re-adjust the volume of the audio signal to the first level in response to event termination information being received by the electronic device from the mobile terminal or forced termination information is received by the electronic device from a user. 
     The controller may be configured to re-adjust the volume of the audio signal to the first level in response to a time duration that has passed after the volume of the audio signal is adjusted to the second level being greater than or equal to a threshold time. 
     The electronic device may further include a display configured to display the event generation information. 
     The user input receiver may be further configured to receive a user input commanding to perform the volume adjusting operation according to the event generation information, and wherein the controller may be configured to determine the volume adjusting operation based on the setting information, the event generation information, and the user input. 
     The communicator may be further configured to receive identification (ID) information of the mobile terminal and transmitter information from the mobile terminal, and wherein the display may be configured to display at least one of the ID information and the transmitter information, and the event generation information. 
     The communicator may be configured to register the mobile terminal in a connection terminal list by receiving ID information from the mobile terminal and storing the received ID information. 
     In response to the event generation information being received from a mobile terminal that is not registered in the connection terminal list, the controller may be configured to adjust the volume of the audio signal to a standard level. 
     According to an aspect of another exemplary embodiment, there is provided a mobile terminal which controls an electronic device to adjust volume of an audio signal output from the electronic device, the mobile terminal including: a controller configured to determine a volume adjusting operation to be performed on the audio signal based on usage history information of the mobile terminal in response to an event being generated; and a communicator configured to transmit information about the volume adjusting operation and event generation information to the electronic device. 
     The mobile terminal may further include a user input receiver configured to receive setting information regarding adjusting of the volume of the audio signal, wherein, in response to the event being generated, the controller may be configured to determine the volume adjusting operation based on at least one of the usage history information and the setting information. 
     The communicator may further be configured to transmit at least one of identification (ID) information of the mobile terminal, the usage history information, and event termination information. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a diagram of a system for adjusting volume, according to an exemplary embodiment; 
         FIG. 2  is a diagram of a system for adjusting volume, as an example of the system of  FIG. 1 ; 
         FIG. 3  is a flowchart of a method of adjusting volume, according to an exemplary embodiment; 
         FIG. 4  is a flowchart of an example of operations of a system for adjusting volume according to the method of  FIG. 3 ; 
         FIG. 5  is a flowchart illustrating in detail an example of connecting of  FIG. 4 ; 
         FIG. 6  is a flowchart of an example of operations of a system for adjusting volume according to the connecting of  FIG. 5 ; 
         FIG. 7  is a flowchart illustrating in detail an example of determining a volume adjusting operation and adjusting of volume of  FIG. 4 ; 
         FIG. 8  illustrates an example of setting information of  FIG. 4 ; 
         FIG. 9  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information of  FIG. 8 ; 
         FIG. 10  illustrates an example of setting information of  FIG. 4 ; 
         FIG. 11  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information of  FIG. 10 ; 
         FIG. 12  illustrates an example of setting information of  FIG. 4 ; 
         FIG. 13  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information of  FIG. 12 ; 
         FIG. 14  illustrates an example of setting information of  FIG. 4 ; 
         FIG. 15  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information of  FIG. 14 ; 
         FIG. 16  illustrates an example of setting information of  FIG. 4 ; 
         FIG. 17  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information of  FIG. 16 ; 
         FIG. 18  illustrates an example of setting information of  FIG. 4 ; 
         FIG. 19  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information of  FIG. 18 ; 
         FIG. 20  is a flowchart illustrating a modified example of the operations of the system of  FIG. 4 ; 
         FIG. 21  is a flowchart illustrating an modified example of the operations of the system of  FIG. 4 ; 
         FIG. 22  is a flowchart illustrating an modified example of the operations of the system of  FIG. 4 ; 
         FIG. 23  is a flowchart illustrating in detail an example of displaying of  FIG. 22 ; 
         FIG. 24  is a flowchart illustrating in detail an example of the displaying of  FIG. 22 ; 
         FIG. 25  illustrates an example of a screen displayed on an electronic device according to the displaying of  FIG. 24 ; 
         FIG. 26  is a flowchart illustrating in detail an example of the displaying of  FIG. 22 ; 
         FIG. 27  illustrates an example of a screen displayed on an electronic device according to the displaying of  FIG. 26 ; 
         FIG. 28  is a flowchart illustrating in detail an example of the displaying of  FIG. 22 ; 
         FIG. 29  is a flowchart illustrating a modified example of the operations of the system of  FIG. 22 ; 
         FIG. 30  illustrates an example of a screen displayed on an electronic device according to displaying of  FIG. 29 ; 
         FIG. 31  is a flowchart illustrating an modified example of the operations of the system of  FIG. 4 ; 
         FIG. 32  illustrates an example of a screen displayed on an electronic device according to displaying of  FIG. 31 ; 
         FIG. 33  illustrates an example of a screen displayed on an electronic device according to the displaying of  FIG. 31 ; 
         FIG. 34  is a flowchart illustrating a modified example of the operations of the system of  FIG. 31 ; 
         FIG. 35  illustrates an example of a screen displayed on an electronic device according to displaying of  FIG. 34 ; 
         FIG. 36  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 3 ; 
         FIG. 37  illustrates an example of usage history information of  FIG. 36 ; 
         FIG. 38  is a flowchart illustrating in detail the determining of the volume adjusting operation based on the usage history information of  FIG. 37 ; 
         FIG. 39  illustrates an example of usage history information of  FIG. 36 ; 
         FIG. 40  is a flowchart illustrating in detail the determining of the volume adjusting operation based on the usage history information of  FIG. 39 ; 
         FIG. 41  illustrates an example of usage history information of  FIG. 36 ; 
         FIG. 42  is a flowchart illustrating in detail the determining of the volume adjusting operation based on the usage history information of  FIG. 41 ; 
         FIG. 43  is a flowchart illustrating a modified example of the operations of the system of  FIG. 36 ; 
         FIG. 44  is a flowchart illustrating an modified example of the operations of the system of  FIG. 36 ; 
         FIG. 45  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 3 ; 
         FIG. 46  is a flowchart illustrating a modified example of the operations of the system of  FIG. 45 ; 
         FIG. 47  is a flowchart illustrating an modified example of the operations of the system of  FIG. 45 ; 
         FIG. 48  is a flowchart illustrating an modified example of the operations of the system of  FIG. 45 ; 
         FIG. 49  is a flowchart illustrating an modified example of the method of  FIG. 3 ; 
         FIG. 50  is a flowchart of a method of adjusting volume, according to an exemplary embodiment; 
         FIG. 51  is a flowchart of a method of adjusting volume, according to an exemplary embodiment; 
         FIG. 52  is a diagram of a system for adjusting volume, according to an exemplary embodiment; 
         FIG. 53  is a diagram of a system for adjusting volume, as an example of the system of  FIG. 52 ; 
         FIG. 54  is a flowchart of a method of adjusting volume, according to an exemplary embodiment; 
         FIG. 55  is a flowchart illustrating an example of operations of a system for adjusting volume according to the method of  FIG. 54 ; 
         FIG. 56  is a flowchart illustrating in detail an example of determining of a volume adjusting operation of  FIG. 55 ; 
         FIG. 57  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation of  FIG. 55 ; 
         FIG. 58  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation of  FIG. 55 ; 
         FIG. 59  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 54 ; 
         FIG. 60  is a flowchart illustrating a modified example of the operations of the system according to the method of  FIG. 59 ; 
         FIG. 61  is a diagram of a system for adjusting volume, according to an exemplary embodiment; 
         FIG. 62  is a diagram of a system for adjusting volume, according to an exemplary embodiment; 
         FIG. 63  is a flowchart of a method of adjusting volume, according to an exemplary embodiment; 
         FIG. 64  is a flowchart illustrating an example of operations of a system for adjusting volume according to the method of  FIG. 63 ; 
         FIG. 65  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 63 ; 
         FIG. 66  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 63 ; 
         FIG. 67  is a block diagram of a mobile terminal according to an exemplary embodiment; 
         FIG. 68  is a block diagram of a software structure of a mobile terminal, according to an exemplary embodiment; 
         FIG. 69  is a block diagram of an electronic device according to an exemplary embodiment; and 
         FIG. 70  is a block diagram of a server according to an exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Terms used herein will now be briefly described and then one or more exemplary embodiments will be described in detail. 
     All terms including descriptive or technical terms which are used herein should be construed as having meanings that are obvious to one of ordinary skill in the art. However, the terms may have different meanings according to the intention of one of ordinary skill in the art, precedent cases, or the appearance of new technologies. Also, some terms may be arbitrarily selected by the applicant, and in this case, the meaning of the selected terms will be described in detail in the detailed description of the invention. Thus, the terms used herein have to be defined based on the meaning of the terms together with the description throughout the specification. 
     When a part “includes” or “comprises” an element, unless there is a particular description contrary thereto, the part can further include other elements, not excluding the other elements. In the following description, terms such as “unit” and “module” indicate a unit for processing at least one function or operation, wherein the unit and the block may be embodied as hardware or software or embodied by combining hardware and software. 
     Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
     Hereinafter, one or more exemplary embodiments will be described more fully with reference to the accompanying drawings to be easily executed by one of ordinary skill in the art. The one or more exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited thereto. In drawings, elements irrelevant to description are not shown for clear description, and like elements denote like reference numerals throughout the specification. 
       FIG. 1  is a diagram of a system  10  for adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 1 , the system  10  may include at least one mobile terminal  100  and an electronic device  200 . Although not shown in  FIG. 1 , according to an exemplary embodiment, the system  10  may further include a server. 
     The at least one mobile terminal  100  may be connected to the electronic device  200  via a wireless communication. In the exemplary embodiment, the at least one mobile terminal  100  may be connected to the electronic device  200  via Bluetooth or wireless fidelity (Wi-Fi). However, the exemplary embodiment is not limited thereto, and according to an exemplary embodiment, the at least one mobile terminal  100  may be connected to the electronic device  200  via a wireless communication, such as home radio frequency (RF), high rate wireless personal area network (HR WPAN), ultra wideband (UWB), low rate WPAN (LR WPAN), or IEEE 1394. 
     The electronic device  200  may output an audio signal. Specifically, the electronic device  200  may reproduce various types of content including an audio signal, and may be referred to as a media reproducing apparatus. For example, the electronic device  200  may reproduce video content (such as a TV program image or video-on-demand (VOD)), a personal image (such as user-created content (UCC), a music video, or YouTube image), still image content (such as a photo or a drawing), music content (such as music, a musical program, or a radio broadcast), an application (such as a game or a video call), or text content (such as a map, an electronic book, a letter, a business file, or a webpage). 
     According to the exemplary embodiment, the electronic device  200  may automatically adjust volume of an audio signal when the at least one mobile terminal  100  receives event generation information, such as a call reception notification. According to an exemplary embodiment, the electronic device  200  may automatically adjust the volume of the audio signal based on setting information regarding adjusting of the volume of the audio signal. According to an exemplary embodiment, the electronic device  200  may automatically adjust the volume of the audio signal based on usage history information of the at least one mobile terminal  100 . According to an exemplary embodiment, the electronic device  200  may display event generation information and automatically adjust the volume of the audio signal based on a user input received based on the event generation information. 
       FIG. 2  is a diagram of a system  10   a  for adjusting volume as an example of the system  10  of  FIG. 1 . 
     Referring to  FIG. 2 , the system  10   a  may include first through third mobile terminals  100   a  through  100   c  and the electronic device  200 . 
     The first through third mobile terminals  100   a  through  100   c  may each be a smart phone or a tablet personal computer (PC). However, the types of the mobile terminals  100   a  through  100   c  are not limited thereto, and according to an exemplary embodiment, the mobile terminals  100   a  through  100   c  may each be an arbitrary terminal for providing event generation information. Also, a number of mobile terminals is not limited to three (3) as in  FIG. 2 , and the system  100   a  may include any number of mobile terminals. 
     The electronic device  200  may be a smart television (TV), an internet protocol TV (IPTV), a digital TV (DTV), a computer, a digital broadcasting terminal, an audio reproducing apparatus, a tablet PC, or a navigation. In the exemplary embodiment, the smart TV is a multifunctional TV in which an internet accessing function is combined to a TV and various applications are installed in the TV such that various functions, such as web surfing, VOD watching, social networking service (SNS), and games, are usable. However, the type of the electronic device  200  is not limited thereto, and according to an exemplary embodiment, the electronic device  200  may be an arbitrary device capable of outputting an audio signal. Also, a number of electronic devices is not limited to one, and according to an exemplary embodiment, the system  10   a  may include one or more electronic devices. 
       FIG. 3  is a flowchart of a method of adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 3 , the method according to the exemplary embodiment is a method of adjusting volume of an audio signal output from an electronic device, and the method includes following operations that are performed by the electronic device. For example, the method according to the exemplary embodiment may include operations that are performed in time-series by the electronic device  200  included in the system  10  of  FIG. 1 . Hereinafter, unless stated otherwise, the mobile terminal  100  may be any one of the first through third mobile terminals  100   a  through  100   c  disclosed in  FIG. 2 . 
     In operation S 110 , an electronic device and at least one mobile terminal are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. For example, the electronic device  200  may be connected to the mobile terminal  100  via wireless communication, such as connection via Bluetooth or Wi-Fi. 
     In operation S 120 , at least one of setting information regarding adjusting of volume of an audio signal and usage history information of the at least one mobile terminal is received by the electronic device  200 . For example, the electronic device  200  may receive the setting information through a user interface (UI). Alternatively, the electronic device  200  may receive the setting information from a server. Also, the electronic device  200  may receive the usage history information from the mobile terminal  100 . 
     In operation S 130 , event generation information is received from the at least one mobile terminal. For example, the electronic device  200  may receive the event generation information including, for example, a call reception notification, a message reception notification, or a notification from an application installed in the mobile terminal  100 , from the mobile terminal  100 . 
     In operation S 140 , a volume adjusting operation of the audio signal is determined based on at least one of the setting information and the usage history information, and the event generation information. For example, when the event generation information is received, the electronic device  200  may determine an adjustment level of the audio signal such that the volume of the audio signal is reduced from the current volume based on at least one of the setting information and the usage history information. 
     In operation S 150 , the volume of the audio signal is adjusted according to the determined volume adjusting operation. For example, the electronic device  200  may reduce the volume of the audio signal according to the determined adjustment level. Accordingly, the electronic device  100  may detect generation of an event in the mobile terminal  100  and automatically adjust volume the output of the audio signal without a user having to directly control the electronic device  200  by using, for example, a remote controller. 
       FIG. 4  is a flowchart of an example of operations of a system for adjusting volume according to the method of  FIG. 3 . 
     Referring to  FIG. 4 , the method according to the exemplary embodiment is a method of adjusting volume of an audio signal of an electronic device  200  based on setting information, and includes operations that are performed in time-series by the mobile terminal  100  and the electronic device  200  included in the system  10  of  FIG. 1 . Accordingly, even if omitted, details about the system  10  of  FIG. 1  may also be applied to the method according to the exemplary embodiment. 
     In operation S 1100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. For example, the mobile terminal  100  and the electronic device  200  may be connected to each other via Bluetooth or Wi-Fi. 
     In operation S 1200 , the electronic device  200  receives setting information regarding adjusting of volume of an audio signal. In the exemplary embodiment, the setting information may include one of general volume adjusting information and individual volume adjusting information of the mobile terminal  100 . The general volume adjusting information may include information regarding an adjustment level of volume of an audio signal when event generation information is received regardless of a type of the mobile terminal  100 . The individual volume adjusting information may include at least one of information about whether to apply a situational automatic volume adjusting operation and a situational adjustment level. For example, the individual volume adjusting information may include at least one of adjusting information per (i.e., based on) user, adjusting information per (i.e., based on) program, adjusting information per (i.e., based on) channel, adjusting information per (i.e., based on) program, adjusting information per (i.e., based on) timeslot, and adjusting information per (i.e., based on) transmitter. 
     In operation S 1300 , the mobile terminal  100  transmits event generation information to the electronic device  200 . According to an exemplary embodiment, the mobile terminal  100  may further transmit at least one of identification (ID) information of the mobile terminal  100  and transmitter information to the electronic device  200 . In the exemplary embodiment, the ID information may include at least one of a phone number of the mobile terminal  100 , an address assigned to the mobile terminal  100 , a name of a user using the mobile terminal  100 , and a nickname of the user. Also, the transmitter information may include at least one of a phone number of a transmitter, a photo, a name, and a nickname of the transmitter, which are stored in the mobile terminal  100 . 
     In operation S 1400 , the electronic device  200  determines a volume adjusting operation of the audio signal based on the setting information and the event generation information. For example, when the event generation information is received, the electronic device  200  stores the volume of the audio signal at a point of time when the event generation information is received as a first level, and adjusts the volume of the audio signal to a second level based on at least one of the setting information and usage history information. 
     In operation S 1500 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. For example, the electronic device  200  compares the first and second levels, and change the volume of the audio signal from the first level to the second level when the first level is higher than the second level, and maintain the volume of the audio signal to the first level when the first level is lower than or equal to the second level. 
       FIG. 5  is a flowchart illustrating in detail an example of a method of connecting mobile terminal  100  and the electronic device  200  as shown in  FIG. 4 . 
     Referring to  FIG. 5 , the method of connecting the mobile terminal  100  and the electronic device  200  according to the exemplary embodiment includes following operations performed by an electronic device  200 . For example the method of connecting the mobile terminal  100  and the electronic device  200  according to the exemplary embodiment may include operations that are performed in time-series by the electronic device  200  of the system  10  of  FIG. 1 . 
     In operation S 112 , the electronic device  200  searches for nearby devices. In operation S 114 , the electronic device  200  receives ID information from the at least one mobile terminal  100 . In the exemplary embodiment, the ID information may include at least one of a phone number of the at least one mobile terminal  100 , an address assigned to the at least one mobile terminal  100 , a name of a user using the at least one mobile terminal  100 , and a nickname of the user. 
     In operation S 116 , the electronic device  200  registers the at least one mobile terminal  100  in a connection terminal list. Operations S 112  through S 116  of the exemplary embodiment may also be referred to as a pairing operation. 
       FIG. 6  is a flowchart of an example of operations of a system for adjusting volume according to the method of connecting of the mobile terminal  100  and the electronic device  200  as described in  FIG. 5 . 
     Referring to  FIG. 6 , the method of connecting according to the exemplary embodiment includes operations that are processed in time-series by the mobile terminal  100  and the electronic device  200  included in the system  10  of  FIG. 1 . 
     In operation S 1110 , the electronic device  200  detects a connection request. For example, the electronic device  200  may receive the connection request input through a UI. In operation S 1120 , the electronic device  200  searches for nearby devices. In operation S 1130 , the mobile terminal  100  transmits ID information to the electronic device  200 . 
     In operation S 1140 , the electronic device  200  requests the mobile terminal  100  for an ID name. In operation S 1150 , the mobile terminal  100  transmits the ID name to the electronic device  200 . In operation S 1160 , the electronic device  200  registers the ID name in a connection terminal list. For example, the electronic device  200  may store the connection terminal list in a partial region of a memory (not shown), and register the mobile terminal  100  by storing the ID name received from the mobile terminal  100  in the connection terminal list. 
       FIG. 7  is a flowchart illustrating in detail an example of the determining the volume adjusting operation (S 140 ) and the adjusting of the volume (S 150 ) of  FIG. 4 . 
     Referring to  FIG. 7 , the determining of the volume adjusting operation (S 140  of  FIG. 4 ) and the adjusting of the volume (S 150  of  FIG. 4 ) according to the exemplary embodiment may include following operations performed by an electronic device  200 . For example, the determining of the volume adjusting operation and the adjusting of the volume, according to the exemplary embodiment, may include operations that are processed in time-series by the electronic device  200  of the system  10  of  FIG. 1 . 
     In operation S 1420 A, the electronic device  200  stores the volume of the audio signal at the point of time when the event generation information is received as the first level. For example, the electronic device  200  may store the first level that is the volume of the audio signal currently output, in the memory of the electronic device  200 . 
     In operation S 1420 B, the electronic device  200  determines to adjust the volume of the audio signal to the second level according to the setting information. For example, the electronic device  200  may determine the second level based on a situational volume adjustment level stored in the setting information. 
     In operation S 1520 , the electronic device  200  determines whether the first level is higher than the second level. When the first level is higher than the second level, operation S 1540  is performed. When the first level is lower than or equal to the second level, operation S 1560  is performed. 
     In operation S 1540 , the volume of the audio signal is changed from the first level to the second level. For example, the electronic device  200  may reduce the volume of the audio signal to the second level. Accordingly, a user may detect an event generation notification, such as a call reception notification, a message reception notification, or a notification from an application, from the mobile terminal  100 . 
     In operation S 1560 , the volume of the audio signal is maintained at the first level. For example, when the first level that is the volume of the audio signal currently output (i.e., at the time of the event generation information is received) is not higher than an adjustment level, the electronic device  200  may not separately adjust the volume of the audio signal and maintain the first level that is the current volume. At this time, because the first level that is the current volume is sufficiently low, the user may be able to detect the event generation notification, such as the call reception notification, the message reception notification, or the notification from the application, from the mobile terminal  100 . 
       FIG. 8  illustrates an example of setting information SI 1  of the setting information described in  FIG. 4 . 
     Referring to  FIG. 8 , the setting information SI 1  may correspond to adjusting information per user, and may include priority information about adjusting volume of a plurality of users respectively using a plurality of mobile terminals. In the exemplary embodiment, the setting information SI 1  may include information about whether to apply an automatic volume adjusting function to each of the plurality of users. Also, the setting information SI 1  may include an adjustment level for each of the plurality of users. 
     In the exemplary embodiment, a first user, a second user and a third user are users stored in a connection terminal list of the electronic device  200 . As described above, the electronic device  200  may be pre-connected/pre-paired to the first, second and third mobile terminals  100   a ,  100   b  and  100   c , for example, and may store ID information of the first, second and third mobile terminals  100   a ,  100   b  and  100   c  in the connection terminal list. In the exemplary embodiment, the first, second and third users may be classified and stored according to names, nicknames, or phone numbers. 
     For example, the first user may be a user who receives a lot of important calls, and at this time, the first user may be determined to be a user having the highest priority. Accordingly, in the setting information SI 1  of the first user, the automatic volume adjusting function may be applied and the adjustment level may be determined to be a first user level. In the exemplary embodiment, the first user level (i.e., an adjustment level for the first user) may be predetermined to be 0, and the electronic device  200  may be in a mute mode such that the audio signal is not output from the electronic device  200  when the first mobile terminal  100   a  transmits event generation information. That is, when the event generation information is received, the electronic device  200  determines priority amongst the plurality of users based on the priority information of the adjusting information per user and the electronic device  200  adjusts the volume of the audio signal to a first user level corresponding to an adjustment level for a first user having a higher priority than remaining users of the plurality of users. 
     For example, the second user may be a user who considerably receives important calls, and at this time, the second user may be determined to be a user having the second highest priority. Accordingly, in the setting information SI 1  of the second user, the automatic volume adjusting function may be applied and the adjustment level may be determined to be a second user level. In the exemplary embodiment, the second user level (i.e., an adjustment level for the second user) may be 2, and the volume of the audio signal output from the electronic device  200  may be very low. 
     For example, the third user may be a user who does not receive important calls much, and at this time, the third user may be determined to be a user having the third highest priority. Accordingly, in the setting information SI 1  of the third user, the automatic volume adjusting function may be applied and the adjustment level may be determined to be a third user level (i.e., an adjustment level for the second user). In the exemplary embodiment, the third user level may be 4, and the volume of the audio signal output from the electronic device  200  may be low. 
     Also, in the exemplary embodiment, an unregistered user is a user who is not stored in the connection terminal list of the electronic device  200 . Because an unregistered mobile terminal used by the unregistered user is not pre-connected to the electronic device  200 , the electronic device  200  may not store ID information of the unregistered mobile terminal in the connection terminal list. 
     For example, the unregistered user may be a user who does not resides in a place, such as a house or an office, where the electronic device  200  is located. Alternatively, the unregistered user may be a user who resides in the space where the electronic device  200  is located, but uses the unregistered mobile terminal that is not pre-connected to the electronic device  200 . Accordingly, in the setting information SI 1  of the pre-registered user, the automatic volume adjusting function may be applied and the adjustment level may be determined to be a standard level. In the exemplary embodiment, the standard level may be 6, and the volume of the audio signal output from the electronic device  200  may be a little low. However, if ambient noise is quite loud or a notification sound of the unregistered mobile terminal of the unregistered user is small, the unregistered user may not hear an event generation notification from the unregistered mobile terminal. 
       FIG. 9  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information SI 1  of  FIG. 8 . 
     Referring to  FIG. 9 , the determining of the volume adjusting operation according to the exemplary embodiment includes following operations performed by an electronic device. For example, the determining of the volume adjusting operation according to the exemplary embodiment may include operations that are performed in time-series by the electronic device  200  of the system  10  of  FIG. 1   
     In operation  1410 , a user of a mobile terminal is checked. For example, the electronic device  200  may check a user of a mobile terminal that transmitted event generation information. The electronic device  200  may receive ID information from the mobile terminal, thereby obtaining user information of the mobile terminal. 
     In operation S 1412 , it is determined whether the checked user of the mobile terminal is registered in adjusting information per user. For example, the electronic device  200  may determine whether the checked user is registered in the adjusting information per user by referring to the adjusting information per user. When the checked user is registered in the adjusting information per user, operation S 1414  is performed. When the checked user is not registered in the adjusting information per user, operation S 1418  is performed. 
     In operation S 1414 , a user level (i.e., an adjustment level of a specific user) of the checked user is checked or determined. For example, the electronic device  200  may determine the user level of the checked user by referring to the adjusting information per user. For example, the electronic device  200  determines that the checked user is a first user, the electronic device  200  may determine a first user level of the first user. 
     In operation S 1416 , volume of an audio signal is changed from a first level to the user level. For example, when the checked user is the first user, the electronic device  200  may change the volume of the audio signal from the first level to the first user level. 
     In operation S 1418 , when the checked user is not registered in adjusting information per user, the volume of the audio signal is changed from the first level to a standard level. For example, when the checked user is not registered in a connection terminal list, the electronic device  200  may change the volume of the audio signal from the first level to a standard level of an unregistered user, which is predetermined and included in the adjusting information per user. 
       FIG. 10  illustrates an example of setting information SI 2  of the setting information described in  FIG. 4 . 
     Referring to  FIG. 10 , the setting information SI 2  may correspond to adjusting information per program genre. For example, the setting information SI 2  may include information about whether to apply an automatic volume adjusting function for each of a plurality of program genres. Also, the setting information SI 2  may include an adjustment level for each of the plurality of program genres. 
     In the exemplary embodiment, when a program genre of content being reproduced in the electronic device  200  is news, sports, or current affairs and education, the automatic volume adjusting function may not be applied. Also, when a program genre of content being reproduced in the electronic device  200  is series, variety shows, or cartoons, the automatic volume adjusting function ma be applied. 
     Also, in the exemplary embodiment, in the setting information SI 2  of the series, the automatic volume adjusting function may be applied and an adjustment level may be determined to be a first genre level, for example, 2. In the setting information SI 2  of the variety shows, the automatic volume adjusting function may be applied and an adjustment level may be determined to be a second genre level, for example, 4. In the setting information SI 2  of the cartoons, the automatic volume adjusting function may be applied and an adjustment level may be determined to be a third genre level, for example, 2, 
       FIG. 11  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information SI 2  of  FIG. 10 . 
     Referring to  FIG. 11 , the determining of the volume adjusting operation according to the exemplary embodiment includes following operations performed by an electronic device  200 . For example, the determining of the volume adjusting operation according to the exemplary embodiment may include operations that are processed in time-series by the electronic device  200  of the system  10  of  FIG. 1   
     In operation S 1420 , the electronic device  200  checks/determines a program genre of a program that is currently reproduced. 
     In operation S 1422 , the electronic device  200  determines whether the checked program genre is a program genre registered in adjusting information per program genre. When the checked program genre is registered in the adjusting information per program genre, operation S 1424  is performed. When the checked program genre is not registered in the adjusting information per program genre, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1424 , the electronic device  200  determines whether to apply an automatic volume adjusting function on the checked program genre. When it is determined that the automatic volume adjusting function is to be applied, operation S 1426  is performed. When it is determined that the automatic volume adjusting function is not to be applied, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1426 , the electronic device  200  checks/determines an adjustment level of the checked program genre. The electronic device  200  may check the adjustment level to be a first genre level when, for example, the checked program genre is series, by referring to the adjusting information per program genre. 
     In operation S 1428 , the electronic device  200  changes the volume of the audio signal from the first level to the checked adjustment level. For example, when the program genre is series, the electronic device  200  may change the volume of the audio signal from the first level to the first genre level according to the information stored in the adjusting information per program genre. 
       FIG. 12  illustrates an example of setting information SI 3  of  FIG. 4 . 
     Referring to  FIG. 12 , the setting information SI 3  may correspond to adjusting information per program. For example, the setting information SI 3  may include information about whether to apply an automatic volume adjusting function to each of a plurality of programs. Also, the setting information SI 3  may include an adjustment level for each of the plurality of programs. 
     In the exemplary embodiment, the setting information SI 3  may include information about whether to apply an automatic volume adjusting function and an adjustment level for programs, such as ‘CNN Newsroom’, ‘The Walking Dead’, ‘Saturday Night Live’, ‘2014 World Series’, ‘Spongebob’, and ‘The Debates’. Here, types of the programs are changeable, whether to apply an automatic volume adjusting function per program is changeable, and an adjustment level per program is also changeable. 
     For example, an automatic volume adjusting function may not be applied to ‘CNN Newsroom’, ‘2014 World Series’, and ‘The Debates’, an automatic volume adjusting function may be applied to ‘The Walking Dead’, ‘Saturday Night Live’, and ‘Spongebob’, and an adjustment level may be determined to one of a first program level, a second program level and a third program level as shown in the last column of  FIG. 12 . 
       FIG. 13  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information SI 3  of  FIG. 12 . 
     Referring to  FIG. 13 , the determining of the volume adjusting operation according to the exemplary embodiment includes following operations performed by an electronic device  200 . For example, the determining of the volume adjusting operation according to the exemplary embodiment may include operations that are performed in time-series by the electronic device  200  of the system  10  of  FIG. 1 . 
     In operation S 1430 , the electronic device  200  checks or determines a program that is currently reproduced in the electronic device  200 . 
     In operation S 1432 , the electronic device  200  determines whether the checked program is registered in adjusting information per program. When the checked program is determined to be registered in the adjusting information per program, operation S 1434  is performed. When the checked program is determined to be not registered in the adjusting information per program, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1434 , the electronic device  200  determines whether to apply an automatic volume adjusting function to the checked program. When the automatic volume adjusting function is to be applied, operation S 1436  is performed. When the automatic volume adjusting function is not to be applied, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1436 , the electronic device  200  checks for or determines an adjustment level of the checked program. For example, when the checked program is ‘The Walking Dead’, the electronic device  200  may determine the adjustment level to be a first program level by referring to the adjusting information per program. 
     In operation S 1438 , the electronic device  200  changes the volume of the audio signal from the first level to the checked adjustment level. For example, when the checked program is ‘The Walking Dead’, the electronic device  200  may change the volume of the audio signal from the first level to the first program level according to the information stored in the adjusting information per program. 
       FIG. 14  illustrates an example of setting information SI 4  of  FIG. 4 . 
     Referring to  FIG. 14 , the setting information SI 4  may correspond to adjusting information per channel. For example, the setting information SI 4  may include information about whether to apply an automatic volume adjusting function to each of a plurality of channels. Also, the setting information SI 4  may include an adjustment level for each of the plurality of channels. 
     In the exemplary embodiment, the setting information SI 4  may include information about whether to apply an automatic volume adjusting function and an adjustment level for channels, such as Ch. 6, Ch. 7, Ch. 9, Ch. 10, and Ch. 11. Here, whether to apply an automatic volume adjusting function per channel is changeable, and an adjustment level per channel is changeable. 
     For example, an automatic volume adjusting function may not be applied to Ch. 6 and Ch. 10, an automatic volume adjusting function may be applied to Ch. 7, Ch, 9, and Ch. 11, and an adjustment level may be determined to one of a first channel level, a second channel level and a third channel level. 
       FIG. 15  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information SI 4   FIG. 14 . 
     Referring to  FIG. 15 , the determining of the volume adjusting operation according to the exemplary embodiment includes following operations performed by an electronic device  200 . For example, the determining of the volume adjusting operation according to the exemplary embodiment may include operations that are processed in time-series by the electronic device  200  of the system  10  of  FIG. 1   
     In operation S 1440 , the electronic device  200  checks or determines a channel that is currently reproduced. 
     In operation S 1442 , the electronic device  200  determines whether the checked channel is registered in adjusting information per channel. When the checked channel is determined to be registered, operation S 1444  is performed. When the checked channel is determined to be not registered, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1444 , the electronic device  200  determines whether to apply an automatic volume adjusting function to the checked channel. When the automatic volume adjusting function is to be applied, operation S 1446  is performed. When the automatic volume adjusting function is not to be applied, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1446 , the electronic device  200  checks or determines an adjustment level of the checked channel. For example, when the checked channel is Ch. 7, the electronic device  200  may check that the adjustment level is a first channel level by referring to the adjusting information per channel. 
     In operation S 1448 , the electronic device  200  changes the volume of the audio signal from the first level to the checked adjustment level. For example, when the checked channel is Ch. 7, the electronic device  200  may change the volume of the audio signal from the first level to the first channel level according to the adjusting information per channel. 
       FIG. 16  illustrates an example of setting information SI 5  of  FIG. 4 . 
     Referring to  FIG. 16 , the setting information SI 5  may correspond to adjusting information per timeslot. For example, the setting information SI 5  may include information about whether to apply an automatic volume adjusting function to each of a plurality of timeslots. Also, the setting information SI 5  may include an adjustment level for each of the plurality of timeslots. 
     In the exemplary embodiment, the setting information SI 5  may include information about whether to apply an automatic volume adjusting function and an adjustment level for each of timeslots, such as 00:00 to 06:00, 06:00 to 12:00, 12:00 to 18:00, and 18:00 to 24:00. In the exemplary embodiment, sections of the timeslots are changeable, whether to apply an automatic volume adjusting function per timeslot is changeable, and an adjustment level per timeslot is changeable. 
     For example, an automatic volume adjusting function may not be applied to 00:00 to 06:00 and 12:00 to 18:00, an automatic volume adjusting function may be applied to 06:00 to 12:00 and 18:00 to 24:00, and an adjustment level may be determined to be one of first and second timeslot levels. 
       FIG. 17  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information SI 5  of  FIG. 16 . 
     Referring to  FIG. 17 , the determining of the volume adjusting operation according to the exemplary embodiment includes following operations performed by an electronic device. For example, the determining of the volume adjusting operation according to the exemplary embodiment may include operations that are processed in time-series by the electronic device  200  of the system  10  of  FIG. 1 . 
     In operation S 1450 , the electronic device  200  checks or determines the current time. 
     In operation S 1452 , the electronic device  200  determines whether the current time is a timeslot registered in adjusting information per timeslot. When the timeslot is determined to be registered, operation S 1454  is performed. When the timeslot is determined to be not registered, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting function. 
     In operation S 1454 , the electronic device  200  determines whether an automatic volume adjusting function is to be applied to the timeslot. When the automatic volume adjusting function is to be applied, operation S 1456  is performed. When the automatic volume adjusting function is not to be applied, the determining of the volume adjusting operation is ended and the electronic device  200  determines whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1456 , the electronic device  200  checks or determines an adjustment level of the timeslot. For example, when the timeslot is 06:00 to 12:00, the electronic device  200  may determine a first timeslot level corresponding to the timeslot by referring to the adjusting information per timeslot. 
     In operation S 1458 , the electronic device  200  changes the volume of the audio signal from the first level to the checked adjustment level. For example, when the timeslot is 06:00 to 12:00, the electronic device  200  may change the volume of the audio signal from the first level to the first timeslot level. 
       FIG. 18  illustrates an example of setting information SI 6  of  FIG. 4 . 
     Referring to  FIG. 18 , the setting information SI 6  may correspond to adjusting information per transmitter. For example, the setting information SI 6  may include information about whether to apply an automatic volume adjusting function to each of a plurality of transmitters. Also, the setting information SI 6  may include an adjustment level for each of the plurality of transmitters. 
     In the exemplary embodiment, the setting information SI 6  may include information about whether to apply an automatic volume adjusting function and an adjustment level for each of first, second, third and fourth transmitters. In the exemplary embodiment, the transmitters may be changed, added, or deleted, whether to apply an automatic volume adjusting function per transmitter is changeable, and an adjustment level per transmitter is changeable. 
     For example, an automatic volume adjusting function may be applied to the first through fourth transmitters, and the first through fourth transmitters may respectively have first through fourth transmitter levels. For example, when a call from the first transmitter must be answered, the first transmitter may be determined to have highest priority and the first transmitter level may be determined to be lowest. 
       FIG. 19  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation based on the setting information SI 6  of  FIG. 18 . 
     Referring to  FIG. 19 , the determining of the volume adjusting operation according to the exemplary embodiment includes following operations performed by an electronic device  200 . For example, the determining of the volume adjusting operation according to the exemplary embodiment may include operations that are processed in time-series by the electronic device  200  of the system  10  of  FIG. 1 . 
     In operation S 1460 , the electronic device  200  checks or determines a phone number of a transmitter. 
     In operation S 1462 , the electronic device  200  determines whether the transmitter is registered in adjusting information per transmitter. When the transmitter is determined to be registered, operation S 1464  is performed. When the transmitter is determined to be not registered, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1464 , the electronic device  200  determines whether to apply an automatic volume adjusting function to the transmitter. When the automatic volume adjusting function is to be applied, operation S 1446  is performed. When the automatic volume adjusting function is not to be applied, the determining of the volume adjusting operation is ended and the electronic device  200  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 1466 , the electronic device  200  checks or determines an adjustment level of the corresponding transmitter. For example, when the transmitter is determined to be the first transmitter, the electronic device  200  may check or determine the first transmitter level corresponding to the first transmitter by referring to the adjusting information per transmitter. 
     In operation S 1468 , the electronic device  200  changes the volume of the audio signal from the first level to the checked adjustment level. For example, when the transmitter is the first transmitter, the electronic device  200  may change the volume of the audio signal from the first level to the first transmitter level. 
       FIG. 20  is a flowchart illustrating a modified example of the operations of the system of  FIG. 4 . 
     Referring to  FIG. 20 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on setting information, and further include operations S 1600  and S 1630  compared to the operations of  FIG. 4 . 
     In operation S 1100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 1200 , the electronic device  200  receives the setting information regarding adjusting of the volume of the audio signal. In operation S 1300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . In operation S 1400 , the electronic device  200  determines the volume adjusting operation of the audio signal based on the setting information and the event generation information. In operation S 1500 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
     In operation S 1600 , the mobile terminal  100  transmits event termination information to the electronic device  200 . For example, when a call reception sound is no longer ringing or a call is ended, the mobile terminal  100  may generate the event termination information and transmit the event termination information to the electronic device  200 . 
     In operation S 1630 , the electronic device  200  re-adjusts the volume of the audio signal according to the event termination information. For example, the electronic device  200  may re-adjust the volume of the audio signal to the first level that is the volume at the point of time when the event generation information is received, according to the event termination information. Accordingly, for example, when the call is ended or the call reception sound is stopped, the volume of the audio signal may be automatically restored or reverted back to a previous level (i.e., the first level), and thus a control operation of the user by a remote control or the like is not required and user convenience is increased. 
       FIG. 21  is a flowchart illustrating a modified example of the operations of the system of  FIG. 4 . 
     Referring to  FIG. 21 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on setting information, and further include operations S 1660  and S 1690  compared to the operations of  FIG. 4 . 
     In operation S 1100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 1200 , the electronic device  200  receives the setting information regarding adjusting of the volume of the audio signal. In operation S 1300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . In operation S 1400 , the electronic device  200  determines the volume adjusting operation of the audio signal based on the setting information and the event generation information. In operation S 1500 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
     In operation S 1660 , the electronic device  200  receives forced termination information. In the exemplary embodiment, the forced termination information may be information commanding to end the volume adjusting operation. For example, the electronic device  200  may receive the forced termination information via a UI. For example, when event generation information is generated by a mobile terminal of the first user, a second user may input the forced termination information to the electronic device  200 . Alternatively, if a user does not want to take a call and ignores the event generation information, the user may input the forced termination information to the electronic device  200 . 
     In operation S 1690 , the electronic device  200  re-adjusts the volume of the audio signal according to the forced termination information. For example, the electronic device  200  may re-adjust the volume of the audio signal to the first level that is the volume at the point of time when the event generation information is received, according to the forced termination information. 
       FIG. 22  is a flowchart illustrating a modified example of the operations of the system of  FIG. 4 . 
     Referring to  FIG. 22 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on setting information, and further include displaying of the event generation information instead of operations S 1400  and S 1500  compared to the operations of  FIG. 4 . 
     In operation S 1100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 1200 , the electronic device  200  receives the setting information regarding adjusting of the volume of the audio signal. 
     In operation S 1300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . Also, the mobile terminal  100  may further transmit at least one of ID information of the mobile terminal  100  and transmitter information to the electronic device  200 . In the exemplary embodiment, the ID information may include at least one of a phone number of the mobile terminal  100 , an address assigned to the mobile terminal  100 , a name of a user using the mobile terminal  100 , and a nickname of the user, and the transmitter information may include at least one of a phone number of a transmitter, and a photo, a name, and a nickname of the transmitter, which are stored in the mobile terminal  100 . 
     Thereafter, in operation S 1700 , the electronic device  200  displays the event generation information based on the setting information. For example, the electronic device  200  may determine whether to display the event generation information based on the setting information, and when it is determined to display the event generation information, may display the event generation information. Also, the electronic device  200  may further display at least one of the ID information and the transmitter information. 
     In operation S 1750 , a user input is received. For example, the electronic device  200  may receive a user input of commanding to perform a volume adjusting operation through a UI. 
     In operation S 1900 , the volume of the audio signal is adjusted according to the user input. For example, when the user input includes a command or request to reduce the volume, the electronic device  200  may adjust the volume to a pre-set adjustment level. Alternatively, when the user input includes a command or request to maintain the volume, the electronic device  200  may not perform the volume adjusting operation. 
       FIG. 23  is a flowchart illustrating in detail an example of the displaying (S 1700 ) of  FIG. 22 . 
     Referring to  FIG. 23 , in operation S 1710 , the electronic device  200  checks or determines at least one of ID information of a mobile terminal, reproduction information of the electronic device  200 , current time information, and transmitter information. 
     In operation S 1720 , the electronic device  200  determines whether information checked in operation S 1710  corresponds to setting information. In the exemplary embodiment, the setting information may be the setting information SI 1  of  FIG. 8 , the setting information SI 2  of  FIG. 10 , the setting information SI 3  of  FIG. 12 , the setting information SI 4  of  FIG. 14 , the setting information SI 5  of  FIG. 16 , or the setting information SI 6  of  FIG. 18 . When the checked information corresponds to the setting information, operation S 1730  is performed. When the checked information does not correspond to the setting information, the displaying is ended and the automatic volume adjusting function may not be performed. 
     In operation S 1730 , the electronic device  200  determines whether to apply the automatic volume adjusting function to the checked information. When the automatic volume adjusting function is to be applied, operation S 1740  is performed. When the automatic volume adjusting function is not to be applied, the displaying is ended and the automatic volume adjusting function may not be performed. In operation S 1740 , the electronic device  200  displays the event generation information. 
       FIG. 24  is a flowchart illustrating in detail an example of the displaying (S 1700 ) of  FIG. 22 . 
     Referring to  FIG. 24 , in operation S 1711 , the electronic device  200  checks or determines a user of a mobile terminal. In operation S 1713 , the electronic device  200  determines whether the checked user is a user registered in the adjusting information per user. When the checked user is determined to be registered, operation S 1715  is performed. When the checked user is not determined to be registered, the displaying is ended and the automatic volume adjusting function may not be performed. 
     In operation S 1715 , the electronic device  200  determines whether to apply the automatic volume adjusting function to the checked user. When the automatic volume adjusting function is determined to be applied, operation S 1717  is performed. When the automatic volume adjusting function is determined not to be applied, the displaying is ended and the automatic volume adjusting function may not be performed. In operation S 1717 , the electronic device  200  displays the event generation information. 
       FIG. 25  illustrates an example of a screen displayed on the electronic device  200  according to the displaying (S 1700 ) of  FIG. 24 . 
     Referring to  FIG. 25 , the event generation information is displayed, for example, in a form of a pop-up window POP 1 , on a partial region of a screen of the electronic device  200  that is reproducing content. The pop-up window POP 1  may include a plurality of selection icons, such as a volume reducing icon ICON 1 , a mute icon ICON 2 , and a volume maintaining icon ICON 3 . 
     The electronic device  200  may check or determine a user of a mobile terminal, determine whether to apply the automatic volume adjusting function for the checked user based on the adjusting information per user, and display the event generation information in the form of the pop-up window POP 1  if the automatic volume adjusting function is to be applied for the checked user. For example, when the checked user is the first user, for example, mother, the electronic device  200  may display the pop-up window POP 1  including a message “call for mother” on the partial region of the screen. 
       FIG. 26  is a flowchart illustrating in detail an example of the displaying (S 1700 ) of  FIG. 22 . 
     Referring to  FIG. 26 , in operation S 1721 , the electronic device  200  checks or determines a user of a mobile terminal  100  and a transmitter (i.e., a party contacting the user of the mobile terminal  100  via the mobile terminal  100 ). In operation S 1722 , the electronic device  200  determines whether the checked user is registered in the adjusting information per user. In operation S 1723 , the electronic device  200  determines whether to apply the automatic volume adjusting function to the checked user. In operation S 1724 , the electronic device  200  determines whether the checked transmitter is registered in the adjusting information per transmitter. In operation S 1725 , the electronic device  200  determines whether to apply the automatic volume adjusting function to the checked transmitter. In operation S 1726 , the electronic device  200  displays the event generation information. 
       FIG. 27  illustrates an example of a screen displayed on the electronic device  200  according to the displaying (S 1726 ) of  FIG. 26 . 
     Referring to  FIG. 27 , the event generation information is displayed, for example, in a form of a pop-up window POP 2 , on a partial region of the screen of the electronic device  200  that is reproducing content. The pop-up window POP 2  may include a plurality of selection icons, such as the volume reducing icon ICON 1 , the mute icon ICON 2 , and the volume maintaining icon ICON 3 . 
     The electronic device  200  may check or determined a user of a mobile terminal and a transmitter, determine whether to apply the automatic volume adjusting function to the checked user based on the checked user being registered in the adjusting information per user, determine whether to apply the automatic volume adjusting function to the checked transmitter based on the checked transmitter being registered in the adjusting information per transmitter, and display the event generation information in the form of the pop-up window POP 2  if it is determined that the automatic volume adjusting function is applied to the checked user and the checked transmitter. For example, when the checked user is the first user, for example, mother, and the checked transmitter is the second user, for example, loving daughter, the electronic device  200  may display the pop-up window POP 2  including a message “call for mother from loving daughter” on the partial region of the screen. 
       FIG. 28  is a flowchart illustrating in detail an example of the displaying of  FIG. 22 . 
     Referring to  FIG. 28 , in operation S 1731 , the electronic device  200  checks or determines a user of a mobile terminal and a transmitter (i.e., a party contacting the user of the mobile terminal  100  via the mobile terminal  100 ). 
     In operation S 1732 , the electronic device  200  determines whether the checked user is registered in the adjusting information per user. When the checked user is determined to be registered, operation S 1733  is performed. When the checked user is determined to be not registered, the displaying is ended and the electronic device  200  may determine whether to perform the automatic volume adjusting function based on different setting information. 
     In operation S 1733 , the electronic device  200  determines whether to apply the automatic volume adjusting function to the checked user. When the automatic volume adjusting function is determined to be applied, operation S 1734  is performed. When the automatic volume adjusting function is determined to be not applied, the displaying is ended and the electronic device  200  may determine whether to perform the automatic volume adjusting function based on different setting information. 
     In operation S 1734 , the electronic device  200  determines whether the checked transmitter is registered in the adjusting information per transmitter. When the checked transmitter is determined to be registered, operation S 1735  is performed. When the checked transmitter is determined to be not registered, the displaying is ended and the electronic device  200  may determine whether to perform the automatic volume adjusting function based on different setting information. 
     In operation S 1735 , the electronic device  200  determines whether to apply the automatic volume adjusting function to the checked transmitter. When the automatic volume adjusting function is determined to be applied, operation S 1734  is performed. When the automatic volume adjusting function is determined to be not performed, the displaying is ended and the electronic device  200  may determine whether to perform the automatic volume adjusting function based on different setting information. 
     In operation S 1736 , the electronic device  200  checks reproduction information. For example, the reproduction information may be about a title of a program currently reproduced, a genre of the program, a channel, or a current time. 
     In operation S 1737 , the electronic device  200  determines whether to apply the automatic volume adjusting function to the checked reproduction information. When the automatic volume adjusting function is determined to be applied, operation S 1738  is performed. When the automatic volume adjusting function is determined to be not applied, the displaying is ended and the electronic device  200  may determine whether to perform the automatic volume adjusting function based on different setting information. 
     In operation S 1738 , the electronic device  200  displays the event generation information. 
       FIG. 29  is a flowchart illustrating a modified example of the operations of the system of  FIG. 22 . 
     Referring to  FIG. 29 , the operations according to the exemplary embodiment further include operation S 1950  compared to the operations of  FIG. 22 . 
     In operation S 1100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 1200 , the electronic device  200  receives the setting information regarding the adjusting of the volume of the audio signal. In operation S 1300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . 
     In operation S 1700 , the electronic device  200  displays the event generation information based on the setting information. For example, the electronic device  200  may determine whether to display the event generation information based on the setting information, and when it is determined to display the event generation information, display the event generation information. 
     In operation S 1750 , the user input is received. For example, the electronic device  200  may receive a user input of commanding to perform the volume adjusting operation via a UI. Alternatively, the electronic device  200  may receive a user input of commanding to answer or reject a call via a UI. 
     In operation S 1900 , the volume of the audio signal is adjusted according to the user input. For example, when the user input includes a command/request to reduce the volume, the electronic device  200  may adjust the volume to a pre-set adjustment level. Alternatively, when the user input includes a command/request to maintain the volume, the electronic device  200  may not perform the volume adjusting operation. 
     In operation S 1950 , the electronic device  200  transmits the user input to the mobile terminal  100 . For example, when the user input of commanding to answer or reject a call is received from the user, the electronic device  200  may transmit the user input to the mobile terminal  100 , and thus the user may answer or reject the call without having to personally manipulate the mobile terminal  100 , for example, touch the mobile terminal  100 . 
       FIG. 30  illustrates an example of a screen displayed on the electronic device  200  according to displaying (S 1700 ) of  FIG. 29 . 
     Referring to  FIG. 30 , the event generation information is displayed, for example, in a form of a pop-up window POP 3 , on a partial region of the screen of the electronic device  200  that is reproducing content. The pop-up window POP 3  may include a plurality of selection icons, such as the volume reducing icon ICON 1 , the mute icon ICON 2 , the volume maintaining icon ICON 3 , a call answering icon ICON 4 , and a call rejecting icon ICON 5 . 
     The electronic device  200  may check or determine a user of a mobile terminal, determine whether to apply the automatic volume adjusting function to the checked user when the checked user is registered in adjusting information per user, and display the event generation information in the form of the pop-up window POP 3  when the automatic volume adjusting function is determined to be applied. For example, when the user is the first user, for example, mother, the electronic device  200  may display the pop-up window POP 3  including a message “call for mother” on the partial region of the screen of the electronic device  200 . 
     Furthermore, for example, when the first user presses the call answering icon ICON 4  or the call rejecting icon ICON 5 , the electronic device  200  may transmit a relevant user input to the mobile terminal  100 . Accordingly, the first user may answer or reject the call through the electronic device  200  without having to control the mobile terminal  100 . 
       FIG. 31  is a flowchart illustrating a modified example of the operations of the system of  FIG. 4 . 
     Referring to  FIG. 31 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on setting information, and further include displaying the volume adjusting operation compared to the operations of  FIG. 4 . 
     In operation S 1100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 1200 , the electronic device  200  receives the setting information regarding the adjusting of the volume of the audio signal. In operation S 1300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . In operation S 1400 , the electronic device  200  determines the volume adjusting operation of the audio signal based on the setting information and the event generation information. In operation S 1500 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
     In operation S 1800 , the electronic device  200  displays the event generation information. In operation S 1850 , the electronic device  200  receives the user input. In operation S 1900 , the electronic device  200  re-adjusts the volume of the audio signal according to the user input. 
       FIG. 32  illustrates an example of a screen displayed on the electronic device  200  according to displaying (S 1800 ) of  FIG. 31 . 
     Referring to  FIG. 32 , the event generation information is displayed, for example, in a form of a pop-up window POP 4 , on a partial region of the screen of the electronic device  200  that is reproducing content. The pop-up window POP 4  may include a plurality of selection icons, such as a volume restoring icon ICON 6 , the mute icon ICON 2 , and the volume maintaining icon ICON 3 . 
     When the event generation information is received, the electronic device  200  may determine the volume adjusting operation according to the setting information, adjust the volume of the audio signal according to the volume adjusting operation, and display the event generation information in the form of the pop-up window POP 4 . For example, when a user of a mobile terminal  100  that transmitted the event generation information is the first user, for example, mother, the electronic device  200  may display the pop-up window POP 4  including a message “call for mother” on the partial region of the screen. At this time, the first or second user may select the volume restoring icon ICON 6  when it is determined that the volume is not required to be reduced according to the volume adjusting operation. When the volume restoring icon ICON 6  is selected, the electronic device  200  may restore the volume of the audio signal to the original volume, i.e., the volume at the point of time when the event generation information is received. 
       FIG. 33  illustrates an example of a screen displayed on the electronic device  200  according to the displaying (S 1800 ) of  FIG. 31 . 
     Referring to  FIG. 33 , the event generation information is displayed, for example, in a form of a pop-up window POP 5 , on a partial region of the screen of the electronic device  200  that is reproducing content. The pop-up window POP 5  may include a plurality of selection icons, such as the volume restoring icon ICON 6 , the mute icon ICON 2 , and the volume maintaining icon ICON 3 . 
     When the event generation information is received, the electronic device  200  may determine the volume adjusting operation of the audio signal according to the setting information, adjust the volume of the audio signal according to the volume adjusting operation, and display the event generation information in the form of the pop-up window POP 5 . For example, when a user of a mobile terminal that transmitted the event generation information is the first user, for example, mother, and the transmitter is the second user, for example, loving daughter, the electronic device  200  may display the pop-up window POP 5  including a message “call for mother from loving daughter” on the partial region of the screen. At this time, it is determines that the volume is not required to be reduced according to the volume adjusting operation, the first or second user may select the volume restoring icon ICON 6 . When the volume restoring icon ICON 6  is selected, the electronic device  200  may restore the volume of the audio signal to the original volume, i.e., the volume at the point of time when the event generation information is received. 
       FIG. 34  is a flowchart illustrating a modified example of the operations of the system of  FIG. 31 . 
     Referring to  FIG. 34 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on setting information, and further include transmitting of the user input compared to the operations of  FIG. 31 . 
     In operation S 1100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 1200 , the electronic device  200  receives the setting information regarding the adjusting of the volume of the audio signal. In operation S 1300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . In operation S 1400 , the electronic device  200  determines the volume adjusting operation based on the setting information and the event generation information. In operation S 1500 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
     In operation S 1800 , the electronic device  200  displays the event generation information. In operation S 1850 , the electronic device  200  receives the user input. In operation S 1900 , the electronic device  200  re-adjusts the volume of the audio signal according to the user input. In operation S 1950 , the electronic device  200  transmits the user input to the mobile terminal  100 . 
       FIG. 35  illustrates an example of a screen displayed on the electronic device  200  according to displaying (S 1800 ) of  FIG. 34 . 
     Referring to  FIG. 35 , the event generation information is displayed, for example, in a form of a pop-up window POP 6 , on a partial region of the screen of the electronic device  200  that is reproducing content. The pop-up window POP 6  may include a plurality of selection icons, such as the volume restoring icon ICON 6 , the mute icon ICON 2 , the volume maintaining icon ICON 3 , the call answering icon ICON 4 , and the call rejecting icon ICON 5 . 
     When the event generation information is received, the electronic device  200  may determine the volume adjusting operation according to the setting information, adjust the volume of the audio signal according to the volume adjusting operation, and display the event generation information in the form of the pop-up window POP 6 . For example, when a user of a mobile terminal  100  that transmitted the event generation information is the first user, for example, mother, the electronic device  200  may display the popup window POP 6  including a message “call for mother from loving daughter” on the partial region of the screen. 
     Furthermore, for example, when the first user presses the call answering icon ICON 4  or the call rejecting icon ICON 5 , the electronic device  200  may transmit a relevant user input to the mobile terminal  100 . Accordingly, the first user may answer or reject a call through the electronic device  200  without having to personally control the mobile terminal  100 . 
       FIG. 36  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 3 . 
     Referring to  FIG. 36 , the method according to the exemplary embodiment is a method of adjusting volume of an audio signal based on the usage history information, and includes operations that are performed in time-series by the mobile terminal  100  and the electronic device  200  included in the system  100  of  FIG. 1 . Thus, details described above with reference to the system  10  of  FIG. 1  are applied to the method according to the exemplary embodiment even if omitted. 
     In operation S 2100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. 
     In operation S 2200 , the mobile terminal  100  transmits the usage history information to the electronic device  200 . In the exemplary embodiment, the usage history information may include at least one of a call history list, a missed call list, a blocked call list, a contact list, and a favorites list of the mobile terminal  100 . 
     In operation S 2300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . 
     In operation S 2400 , the electronic device  200  determines the volume adjusting operation of the audio signal based on the usage history information and the event generation information. 
     In operation S 2500 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 37  illustrates an example of usage history information U 11  of  FIG. 36 . 
     Referring to  FIG. 37 , the usage history information U 11  may correspond to the call history list of the mobile terminal  100 , for example, an entire call history list or a partial call history list. According to an exemplary embodiment, the usage history information U 11  may include an outgoing call history. According to an exemplary embodiment, the usage history information U 11  may include an incoming call history. According to an exemplary embodiment, the usage history information U 11  may include an outgoing call history and an incoming call history. 
       FIG. 38  is a flowchart illustrating in detail the determining of the volume adjusting operation based on the usage history information U 11  of  FIG. 37 . 
     Referring to  FIG. 38 , in operation S 2410 , the electronic device  200  checks a number of calls with a transmitter from the call history list. In operation S 2415 , the electronic device  200  determines whether the checked number of calls is equal to or higher than a threshold number of calls. When the checked number of calls is equal to or higher than the threshold number of calls, operation S 2420  is performed. When the checked number of calls is lower than the threshold number of calls, the determining is ended and the electronic device  200  may determine whether to perform the automatic volume adjusting function based on different setting information. 
     In operation S 2420 , the electronic device  200  determines that the transmitter is an important call target. In operation S 2425 , the electronic device  200  determines to reduce the volume of the audio signal to the adjustment level. 
       FIG. 39  illustrates an example of usage history information U 12  of  FIG. 36 . 
     Referring to  FIG. 39 , the usage history information U 12  may correspond to the missed call list. For example, a user may unintentionally not answer a call due to the user&#39;s situation. Alternatively, for example, the user may intentionally not answer a call if the user does not want to talk to a transmitter. 
       FIG. 40  is a flowchart illustrating in detail the determining of the volume adjusting operation based on the usage history information U 12  of  FIG. 39 . 
     Referring to  FIG. 40 , in operation S 2430 , the electronic device  200  determines a number of rejected calls from a transmitter, from the missed call list. In operation S 2435 , the electronic device  200  determines whether the number of rejected calls is equal to or higher than a threshold number of rejected calls. When the number of rejected calls is equal to or higher than the threshold number of rejected calls, operation S 2440  is performed. When the number of rejected calls is lower than the threshold number of rejected calls, the determining is ended and the electronic device  200  may determine whether to perform the automatic volume adjusting function based on different setting information. 
     In operation S 2440 , the electronic device  200  determines that the transmitter is a call blocked target. In operation S 2445 , the electronic device  200  maintains the volume of the audio signal. As such, according to the exemplary embodiment, when the transmitter is a call blocked target, the electronic device  200  may maintain the volume of the audio signal without separate adjustment, thereby promoting user convenience. 
       FIG. 41  illustrates an example of usage history information U 13  of  FIG. 36 . 
     Referring to  FIG. 41 , the usage history information U 13  may correspond to the blocked call list. A user may add a phone number of a transmitter the user does not want to talk to the blocked call list, and set the mobile terminal  100  not to display a call from the transmitter. 
       FIG. 42  is a flowchart illustrating in detail the determining of the volume adjusting operation based on the usage history information U 13  of  FIG. 41 . 
     Referring to  FIG. 42 , in operation S 2450 , the electronic device  200  checks the transmitter information. In operation S 2455 , the electronic device  200  determines whether the transmitter is included in the blocked call list. In operation S 2460 , the electronic device  200  maintains the volume of the audio signal. As such, according to the exemplary embodiment, when the transmitter is the call blocked target, the electronic device  200  may maintain the volume of the audio signal without separate adjustment, thereby promoting user convenience. 
       FIG. 43  is a flowchart illustrating a modified example of the operations of the system of  FIG. 36 . 
     Referring to  FIG. 43 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on the usage history information, and include displaying of the event generation information instead of operations S 2400  and S 2500  compared to the operations of  FIG. 36 . 
     In operation S 2100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 2200 , the mobile terminal  100  transmits the usage history information to the electronic device  200 . In operation S 2300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . 
     In operation S 2600 , the electronic device  200  displays the event generation information based on the usage history information. In operation S 2650 , the electronic device  200  receives the user input. In operation S 2800 , the electronic device  200  adjusts the volume of the audio signal according to the user input. 
       FIG. 44  is a flowchart illustrating a modified example of the operations of the system of  FIG. 36 . 
     Referring to  FIG. 44 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on the usage history information, and further include displaying of the event generation information compared to the operations of  FIG. 36 . 
     In operation S 2100 , the mobile terminal  100  and the electronic device  200  are connected to each other. In operation S 2200 , the mobile terminal  100  transmits the usage history information to the electronic device  200 . In operation S 2300 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . In operation S 2400 , the electronic device  200  determines the volume adjusting operation based on the usage history information and the event generation information. In operation S 2500 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
     In operation S 2600 , the electronic device  200  displays the event generation information. In operation S 2700 , the electronic device  200  receives the user input. In operation S 2850 , the electronic device  200  re-adjusts the volume of the audio signal according to the user input. 
       FIG. 45  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 3 . 
     Referring to  FIG. 45 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on the usage history information and the setting information, and include operations that are processed in time-series by the mobile terminal  100  and the electronic device  200  of the system  10  of  FIG. 1 . Accordingly, details described above with reference to the system  10  of  FIG. 1  are applied to the operations according to the exemplary embodiment even if omitted. 
     In operation S 3100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 3200 , the mobile terminal  100  transmits the usage history information to the electronic device  200 . In operation S 3300 , the electronic device  200  receives the setting information regarding adjusting of the volume of the audio signal. In operation S 3400 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . 
     In operation S 3500 , the electronic device  200  adjusts the volume adjusting operation based on the usage history information, the setting information, and the event generation information. In operation S 3600 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 46  is a flowchart illustrating a modified example of the operations of the system of  FIG. 45 . 
     Referring to  FIG. 46 , unlike the operations of  FIG. 45 , in the operations according to the exemplary embodiment, the electronic device  200  receives the setting information first, and then the mobile terminal  100  transmits the usage history information to the electronic device  200 . 
     In operation S 3100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 3150 , the electronic device  200  receives the setting information regarding adjusting of the volume of the audio signal. In operation S 3200 , the mobile terminal  100  transmits the usage history information to the electronic device  200 . In operation S 3400 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . According to an exemplary embodiment, an order of performing operations S 3400  and S 3200  may be changed, and according to an exemplary embodiment, operations S 3400  and S 3200  may be simultaneously performed. 
     In operation S 3500 , the electronic device  200  determines the volume adjusting operation based on the usage history information, the setting information, and the event generation information. In operation S 3600 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 47  is a flowchart illustrating an modified example of the operations of the system of  FIG. 45 . 
     Referring to  FIG. 47 , the operations according to the exemplary embodiment includes displaying of the event generation information and receiving of the user input instead of operations S 3500  and S 3600  compared to the operations of  FIG. 45 . 
     In operation S 3100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 3200 , the mobile terminal  100  transmits the usage history information to the electronic device  200 . In operation S 3300 , the electronic device  200  receives the setting information regarding adjusting of the volume of the audio signal. In operation S 3400 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . 
     In operation S 3700 , the electronic device  200  displays the event generation information based on the usage history information and the setting information. In operation S 3750 , the electronic device  200  receives the user input. In operation S 3800 , the electronic device  200  adjusts the volume of the audio signal according to the user input. 
       FIG. 48  is a flowchart illustrating an modified example of the operations of the system of  FIG. 45 . 
     Referring to  FIG. 48 , the operations according to the exemplary embodiment further includes displaying of the event generation information and receiving of the user input compared to the operations of  FIG. 45 . 
     In operation S 3100 , the mobile terminal  100  and the electronic device  200  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 3200 , the mobile terminal  100  transmits the usage history information to the electronic device  200 . In operation S 3300 , the electronic device  200  receives the setting information regarding adjusting of the volume of the audio signal. In operation S 3400 , the mobile terminal  100  transmits the event generation information to the electronic device  200 . 
     In operation S 3500 , the electronic device  200  determines the volume adjusting operation based on the usage history information, the setting information, and the event generation information. In operation S 3600 , the electronic device  200  adjusts the volume of the audio signal according to the volume adjusting operation. 
     In operation S 3850 , the electronic device  200  displays the event generation information. In operation S 3900 , the electronic device  200  receives the user input. In operation S 3950 , the electronic device  200  re-adjusts the volume of the audio signal according to the user input. 
       FIG. 49  is a flowchart illustrating a modified example of the method of  FIG. 3 . 
     Referring to  FIG. 49 , in operation S 160 , a first time (i.e., a first time duration) passed after the volume of the audio signal is adjusted is determined. In operation S 170 , it is determined whether the first time (i.e., the first time duration) is equal to or greater than a threshold time. In operation S 180 , the volume of the audio signal is re-adjusted after determining that the first time duration is greater than or equal to the threshold time. 
     According to the exemplary embodiment, when the event generation information is received from the mobile terminal  100 , the electronic device  200  may determine the volume adjusting operation based on at least one of the setting information and the usage history information, and adjust the volume of the audio signal according to the volume adjusting operation. However, when the user of the mobile terminal  100  that generated the event generation information is not around the electronic device  200  or the user intentionally ignores the event generation information, the volume of the audio signal needs to be restored to the original volume. Thus, when the first time passed after the volume of the audio signal is adjusted is equal to or higher than the threshold time, the electronic device  200  may restore the volume of the audio signal to the original volume by automatically re-adjusting the volume despite that there is no separate control operation from the user. 
       FIG. 50  is a flowchart of a method of adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 50 , the method according to the exemplary embodiment is a method of adjusting volume of an audio signal output from an electronic device, and includes following operations performed by the electronic device. For example, the method according to the exemplary embodiment may include operations that are processed in time-series by the electronic device  200  of the system  10  of  FIG. 1 . 
     In operation S 210 , an electronic device  200  and at least one mobile terminal  100  are connected to each other. That is, the mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 220 , the electronic device  200  receives event generation information from the at least one mobile terminal  100 . In operation S 230 , the event generation information is displayed. In operation S 240 , a user input is received. In operation S 250 , volume of an audio signal is adjusted according to the user input. 
       FIG. 51  is a flowchart of a method of adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 51 , the method according to the exemplary embodiment is a method of adjusting volume of an audio signal output from an electronic device  200 , and includes following operations performed by the electronic device  200 . For example, the method according to the exemplary embodiment may include operations processed in time-series by the electronic device  200  of the system  10  of  FIG. 1 . 
     In operation S 310 , the electronic device  200  and the at least one mobile terminal  100  are connected to each other. That is, the at least one mobile terminal  100  and the electronic device establish connection (e.g., communication connection) between each other. In operation S 320 , the event generation information is received from the at least one mobile terminal  100 . In operation S 330 , a distance between the electronic device  200  and the at least one mobile terminal  100  is estimated. In operation S 340 , the volume adjusting operation is determined based on the estimated distance and the event generation information. In operation S 350 , the volume of the audio signal is adjusted according to the volume adjusting operation. 
     For example, when the estimated distance is shorter than a threshold distance, the user easily hears the reception sound of the mobile terminal  100 , and thus the electronic device  200  may determine to maintain the volume of the audio signal without adjusting the volume of the audio signal. Alternatively, for example, when the estimated distance is longer than the threshold distance, the user may be difficult to hear the reception sound from the mobile terminal  100 , and thus, for example, the electronic device  200  may determine to mute the volume of the audio signal. 
       FIG. 52  is a diagram of a system  20  for adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 52 , the system  20  may include a mobile terminal  300  and at least one electronic device  400 . Although not shown in  FIG. 52 , according to an exemplary embodiment, the system  20  may further include a server. 
     The mobile terminal  300  may be connected to the at least one electronic device  400  via a wireless communication. In the exemplary embodiment, the mobile terminal  300  may be connected to the at least one electronic device  400  via Bluetooth or Wi-Fi. However, the exemplary embodiment is not limited thereto, and according to an exemplary embodiment, the mobile terminal  400  may be connected to the at least one electronic device  400  via a wireless communication, such as home RF, HR WPAN, UWB, LR WPAN, or IEEE 1394. 
     The at least one electronic device  400  may output an audio signal. For example, the at least one electronic device  400  may reproduce various types of content including an audio signal, and may be referred to as a media reproducing apparatus. For example, the at least one electronic device  400  may reproduce video content (such as a TV program image or VOD), a personal image (such as UCC, a music video, or YouTube image), still image content (such as a photo or a drawing), music content (such as music, a musical program, or a radio broadcast), an application (such as a game or a video call), or text content (such as a map, an electronic book, a letter, a business file, or a webpage). 
     According to the exemplary embodiment, the mobile terminal  300  may determine a volume adjusting operation when an event, such as a phone call, is generated, and transmit information about the volume adjusting operation to the at least one electronic device  400 . According to an exemplary embodiment, the mobile terminal  300  may determine the volume adjusting operation based on setting information regarding adjusting of the volume of the audio signal. According to an exemplary embodiment, the mobile terminal  300  may determine the volume adjusting operation based on usage history information of the mobile terminal  300 . 
       FIG. 53  is a diagram of a system  20   a  for adjusting volume as an example of the system  20  of  FIG. 52 . 
     Referring to  FIG. 53 , the system  20   a  may include the mobile terminal  300  and first, second and third electronic devices  400   a ,  400   b  and  400   c.    
     The mobile terminal  300  may be a smart phone or a tablet PC. However, a type of the mobile terminal  300  is not limited thereto and according to an exemplary embodiment, the mobile terminal  300  may be an arbitrary terminal capable of providing event generation information (e.g., receiving a phone call). 
     The first electronic device  400   a  may be a smart TV, the second electronic device  400   b  may be a computer, and the third electronic device  400  may be a tablet PC. However, the exemplary embodiment is not limited thereto, and according to an exemplary embodiment, the electronic device  400  may be an IPTV, a DTV, a digital broadcasting terminal, an audio reproducing apparatus, or a navigation. However, the type of the electronic device  400  is not limited thereto, and according to an exemplary embodiment, the electronic device  400  may be an arbitrary device capable of outputting an audio signal. Also, a number of the electronic devices  400  is not limited to three (3), and according to an exemplary embodiment, the system  20   a  may include one or more electronic devices. 
       FIG. 54  is a flowchart of a method of adjusting volume, according to an exemplary embodiment. 
     Referring to  FIG. 54 , the method according to the exemplary embodiment is a method of adjusting volume of an audio signal output from an electronic device  400 , and includes following operations performed by a mobile terminal  300 . For example, the method according to the exemplary embodiment may include operations that are processed in time-series by the mobile terminal  300  of the system  20  of  FIG. 52 . Hereinafter, unless stated otherwise, the electronic device  400  may be one of the first, second and third electronic devices  400   a ,  400   b  and  400   c.    
     In operation S 420 , when an event is generated, a volume adjusting operation of an audio signal is determined based on usage history information of a mobile terminal. In the exemplary embodiment, the usage history information may include a call history list, a missed call list, a blocked call list, a contact list, or a favorites list. 
     In operation S 440 , the mobile terminal and at least one electronic device  400  is connected to each other. That is, the mobile terminal  300  and the at least one electronic device  400  establish connection (e.g., communication connection) between each other. For example, the mobile terminal  300  may be connected to the at least one electronic device  400  via a wireless communication, such as Bluetooth or Wi-Fi. 
     In operation S 460 , the mobile terminal transmits information about the volume adjusting operation and event generation information to the at least one electronic device. For example, the mobile terminal  300  may transmit the event generation information including a call reception notification, a message reception notification, or a notification from an application installed in the mobile terminal  300 , to the at least one electronic device  400 . 
     According to an exemplary embodiment, the mobile terminal  300  may further transmit at least one of ID information of the mobile terminal  300  and transmitter information to the at least one electronic device  400 . In the exemplary embodiment, the ID information may include at least one of a phone number of the mobile terminal  300 , an address assigned to the mobile terminal  300 , a name of a user using the mobile terminal  300 , and a nickname of the user. 
       FIG. 55  is a flowchart illustrating an example of operations of a system  20  for adjusting volume according to the method of  FIG. 54 . 
     Referring to  FIG. 55 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on the usage history information, and include operations that are processed in time-series by the mobile terminal  300  and the at least one electronic device  400  of the system  20  of  FIG. 52 . Thus, details described above with reference to the system  20  of  FIG. 52  are applied to the method of the exemplary embodiment even if omitted. 
     In operation S 4100 , the event is generated in the mobile terminal  300 . In operation S 4200 , the mobile terminal  300  determines the volume adjusting operation based on the usage history information. In operation S 4400 , the mobile terminal  300  and the electronic device  400  are connected to each other. That is, the mobile terminal  300  and the electronic device  400  establish connection (e.g., communication connection) between each other. In operation S 4600 , the mobile terminal  300  transmits information about the volume adjusting operation and the event generation information to the electronic device  400 . In operation S 4700 , the electronic device  400  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 56  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation of  FIG. 55 . 
     Referring to  FIG. 56 , in operation S 4210 , the mobile terminal  300  checks or determines a number of calls with a transmitter from the call history list. 
     In operation S 4215 , the mobile terminal  300  determines whether the number of calls with the transmitter is equal to or higher than a threshold number of calls. When the number of calls with the transmitter is determined to be equal to or higher than the threshold number of calls, operation S 4220  is performed. When the number of calls with the transmitter is determined to be lower than the threshold number of calls, the determining is ended and the mobile terminal  300  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 4220 , the mobile terminal  300  determines that the transmitter is an important call target based on the number of calls with the transmitter being determined to be equal to or higher than the threshold number of calls. In operation S 4225 , the mobile terminal  300  determines to reduce the volume of the audio signal to an adjustment level. 
       FIG. 57  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation of  FIG. 55 . 
     Referring to  FIG. 57 , in operation S 4230 , the mobile terminal  300  checks a number of rejected calls from a transmitter, from the missed call list. 
     In operation S 4235 , the mobile terminal  300  determines whether the number of rejected calls is equal to or higher than a threshold number of rejected calls. When the number of rejected calls is determined to be equal to or higher than the threshold number of rejected calls, operation S 4240  is performed. When the number of rejected calls is determined to be lower than the threshold number of rejected calls, the determining is ended and the mobile terminal  300  may determine whether to perform an automatic volume adjusting function based on different setting information. 
     In operation S 4240 , the mobile terminal  300  determines that the transmitter is a call blocked target based on the determination of the number of rejected calls being determined to be equal to or higher than the threshold number of rejected calls. In operation S 4245 , the mobile terminal  300  determines to maintain the volume of the audio signal. 
       FIG. 58  is a flowchart illustrating in detail an example of the determining of the volume adjusting operation of  FIG. 55   
     Referring to  FIG. 58 , in operation S 4250 , the mobile terminal  300  checks the transmitter information. In operation S 4255 , the mobile terminal  300  determines whether the transmitter is included in the blocked call list. When the transmitter is determined to be included in the blocked call list, operation S 4260  is performed. When the transmitter is determined to be not included in the blocked call list, the determining is ended and the mobile terminal  300  may determine whether to perform an automatic volume adjusting function based on different setting function. In operation S 4260 , the mobile terminal  300  determines that the transmitter is a call blocked target based on the determining that the transmitter is included in the blocked call list. In operation S 4265 , the mobile terminal  300  determines to maintain the volume of the audio signal. 
       FIG. 59  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 54 . 
     Referring to  FIG. 59 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on at least one of setting information and the usage history information, and include operations processed in time-series by the mobile terminal  300  and the electronic device  400  of the system  20  of  FIG. 52 . Thus, details described above with reference to the system  20  of  FIG. 52  are applied to the method of the exemplary embodiment even if omitted. 
     In operation S 4000 , the mobile terminal  300  receives setting information regarding adjusting of the volume of the audio signal. In the exemplary embodiment, the setting information may include at least one of general volume adjusting information and individual volume adjusting information. In the exemplary embodiment, the setting information may be the setting information SI 1  of  FIG. 8 , the setting information SI 2  of  FIG. 10 , the setting information SI 3  of  FIG. 12 , the setting information SI 4  of  FIG. 14 , the setting information SI 5  of  FIG. 16 , or the setting information SI 6  of  FIG. 18 . 
     In operation S 4100 , the event is generated in the mobile terminal  300 . In operation S 4300 , the mobile terminal  300  determines the volume adjusting operation based on at least one of the setting information and the usage history information. In operation S 4400 , the mobile terminal  300  and the electronic device  400  are connected to each other. That is, the mobile terminal  300  and the electronic device  400  establish connection (e.g., communication connection) between each other. In operation S 4600 , the mobile terminal  300  transmits the information about the volume adjusting operation and the event generation information to the electronic device  400 . In operation S 4700 , the electronic device  400  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 60  is a flowchart illustrating a modified example of the operations of the system  20  according to the method of  FIG. 59 . 
     Referring to  FIG. 60 , the operations of the exemplary embodiment further include operations S 4800  through S 4950  compared to the operations of  FIG. 59 . 
     In operation S 4000 , the mobile terminal  300  receives the setting information regarding adjusting of the volume of the audio signal. In operation S 4100 , the event is generated in the mobile terminal  300 . In operation S 4300 , the mobile terminal  300  determines the volume adjusting operation based on at least one of the setting information and the usage history information. In operation S 4400 , the mobile terminal  300  and the electronic device  400  are connected to each other. In operation S 4600 , the mobile terminal  300  transmits the information about the volume adjusting operation and the event generation information to the electronic device  400 . In operation S 4700 , the electronic device  400  adjusts the volume of the audio signal according to the volume adjusting operation. 
     In operation S 4800 , the event is ended in the mobile terminal  300 . For example, a call reception sound may not ring anymore in the mobile terminal  300  because the user does not answer a call. Alternatively, for example, the user may end the call and the mobile terminal  300  may be in a standby state. 
     In operation S 4850 , the mobile terminal  300  generates information commanding to re-adjust the volume of the audio signal. For example, the mobile terminal  300  may generate information commanding to restore the volume of the audio signal to an original volume. Although not illustrated, the electronic device  400  may transmit the volume of the audio signal at a point of time when the event generation information to the mobile terminal  300  was received, as the original volume. 
     In operation S 4900 , the mobile terminal  300  transmits at least one of event termination information and the information commanding to re-adjust the volume to the electronic device  400 . In operation S 4950 , the electronic device  400  re-adjusts the volume of the audio signal. Accordingly, the volume of the audio signal may be automatically restored without the user having to personally control the electronic device  400 , and thus user convenience increases. For example, when there are a plurality of the electronic devices  400 , the user does not have to perform individual control operations, and thus user convenience may further increase. 
       FIG. 61  is a diagram of a system  30  for adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 61 , the system  30  may include a plurality of mobile terminals  500  and a plurality of electronic devices  600 . Although not illustrated, according to an exemplary embodiment, the system  30  may further include a server. 
     Each of the plurality of mobile terminals  500  may be connected to the plurality of electronic devices  600  via a wireless communication. Each of the plurality of electronic devices  600  may output an audio signal. For example, each of the plurality of electronic devices  600  may reproduce various types of content including an audio signal, and may be referred to as a media reproducing apparatus. 
     According to the exemplary embodiment, each of the plurality of mobile terminals  500  may determine a volume adjusting operation of an audio signal when an event, such as a phone call, is generated, and transmit information about the volume adjusting operation to the plurality of electronic devices  600 . According to an exemplary embodiment, each of the plurality of mobile terminals  500  may determine the volume adjusting operation based on setting information regarding adjusting of volume of the audio signal. According to an exemplary embodiment, each of the plurality of mobile terminals  500  may determine the volume adjusting operation based on usage history information. 
     Also, according to the exemplary embodiment, each of the plurality of electronic devices  600  may automatically adjust the volume of the audio signal when event generation information, such as a call reception notification, is received from at least one of the plurality of mobile terminals  500 . According to an exemplary embodiment, each of the plurality of electronic devices  600  may automatically adjust the volume of the audio signal based on the setting information regarding adjusting of the volume of the audio signal. According to an exemplary embodiment, each of the plurality of electronic devices  600  may automatically adjust the volume of the audio signal based on the usage history information of at least one of the plurality of mobile terminals  500 . According to an exemplary embodiment, each of the plurality of electronic devices  600  may display the event generation information, and automatically adjust the volume of the audio signal based on a user input according to the event generation information. 
       FIG. 62  is a diagram of a system  40  for adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 62 , the system  40  may include a plurality of mobile terminals  700 , a plurality of electronic devices  800 , and a server  900 . 
     Each of the plurality of mobile terminals  700  may be connected to the server  900 . Each of the plurality of electronic devices  800  may output an audio signal and may be connected to the server  900 . For example, each of the plurality of electronic devices  600  may reproduce various types of content including an audio signal, and may be referred to as a medial reproducing apparatus. 
     The server  900  may determine a volume adjusting operation of an audio signal of each of the plurality of electronic devices  600  based on setting information regarding adjusting of volume of the audio signal and usage history information of at least one of the plurality of mobile terminals  700 . 
       FIG. 63  is a flowchart of a method of adjusting volume according to an exemplary embodiment. 
     Referring to  FIG. 63 , the method according to the exemplary embodiment is a method of adjusting volume of an audio signal output from an electronic device  800 , and includes following operations performed by a server  900 . For example, the method according to the exemplary embodiment may include operations that are processed in time-series by the server  900  of the system  40  of  FIG. 62 . 
     In operation S 510 , at least one of setting information regarding adjusting of volume of an audio signal and usage history information of at least one mobile terminal is received. In operation S 520 , event generation information is received from the at least one mobile terminal. In operation S 530 , a volume adjusting operation of the audio signal is determined based on at least one of the setting information and the usage history information, and the event generation information. In operation S 540 , information about the volume adjusting operation is transmitted to at least one electronic device. 
       FIG. 64  is a flowchart illustrating an example of operations of a system for adjusting volume according to the method of  FIG. 63 . 
     Referring to  FIG. 64 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on the setting information, and include operations that are processed in time-series by the mobile terminal  700 , the electronic device  800 , and the server  900  of the system  40  of  FIG. 62 . Accordingly, details described above with reference to the system  40  of  FIG. 62  are applied to the method according to the exemplary embodiment even if omitted. 
     In operation S 5000 , the mobile terminal  700  and the server  900  are connected to each other. That is, the mobile terminal  700  and the server  900  establish connection (e.g., communication connection) between each other. In operation S 5050 , the electronic device  800  and the server  900  are connected to each other. That is, the electronic device  800  and the server  900  establish connection (e.g., communication connection) between each other. 
     In operation S 5100 , the server  900  receives the setting information regarding adjusting of the volume of the audio signal. For example, the setting information may be the setting information SI 1  of  FIG. 8 , the setting information SI 2  of  FIG. 10 , the setting information SI 3  of  FIG. 12 , the setting information SI 4  of  FIG. 14 , the setting information SI 5  of  FIG. 16 , or the setting information SI 6  of  FIG. 18 . 
     In operation S 5200 , the mobile terminal  700  transmits the event generation information to the server  900 . For example, the mobile terminal  700  may transmit the event generation information including a call reception notification, a message reception notification, or a notification from an application installed in the mobile terminal  700  to the server  900 . 
     In operation S 5300 , the server  900  determines the volume adjusting operation of the audio signal based on the setting information and the event generation information. In operation S 5400 , the server  900  transmits information about the volume adjusting operation to the electronic device  800 . In operation S 5500 , the electronic device  800  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 65  is a flowchart illustrating an example of the operations of the system according to the method of  FIG. 63 . 
     Referring to  FIG. 65 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on the usage history information, and include operations that are processed in time-series by the mobile terminal  700 , the electronic device  800 , and the server  900  of the system  40  of  FIG. 62 . Thus, details described above with reference to the system  40  of  FIG. 62  are applied to the method according to the exemplary embodiment even if omitted. 
     In operation S 5000 , the mobile terminal  700  and the server  900  are connected to each other. That is, the mobile terminal  700  and the server  900  establish connection (e.g., communication connection) between each other. In operation S 5050 , the electronic device  800  and the server  900  are connected to each other. That is, the electronic device  800  and the server  900  establish connection (e.g., communication connection) between each other. 
     In operation S 5150 , the mobile terminal  700  transmits the usage history information to the server  900 . For example, the usage history information may be the usage history information U 11  of  FIG. 37 , the usage history information U 12  of  FIG. 39 , or the usage history information U 13  of  FIG. 41 . 
     In operation S 5200 , the mobile terminal  700  transmits the event generation information to the server  900 . For example, the mobile terminal  700  may transmit the event generation information including a call reception notification, a message reception notification, or a notification from an application installed in the mobile terminal  700  to the server  900 . 
     In operation S 5320 , the server  900  determines the volume adjusting operation based on the setting information and the event generation information. In operation S 5400 , the server  900  transmits information about the volume adjusting operation to the electronic device  800 . In operation S 5500 , the electronic device  800  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 66  is a flowchart illustrating an example of the operations of the system  40  according to the method of  FIG. 63 . 
     Referring to  FIG. 66 , the operations according to the exemplary embodiment correspond to a method of adjusting volume of an audio signal based on the setting information and the usage history information, and include operations that are processed in time-series by the mobile terminal  700 , the electronic device  800 , and the server  900  of the system  40  of  FIG. 62 . Thus, details described above with reference to the system  40  of  FIG. 62  are applied to the method according to the exemplary embodiment even if omitted. 
     In operation S 5000 , the mobile terminal  700  and the server  900  are connected to each other. That is, the mobile terminal  700  and the server  900  establish connection (e.g., communication connection) between each other. In operation S 5050 , the electronic device  800  and the server  900  are connected to each other. That is, the electronic device  800  and the server  900  establish connection (e.g., communication connection) between each other. 
     In operation S 5100 , the server  900  receives the setting information regarding adjusting of the volume of the audio signal. For example, the setting information may be the setting information SI 1  of  FIG. 8 , the setting information S 12  of  FIG. 10 , the setting information S 13  of  FIG. 12 , the setting information S 14  of  FIG. 14 , the setting information S 15  of  FIG. 16 , or the setting information S 16  of  FIG. 18 . 
     In operation S 5150 , the mobile terminal  700  transmits the usage history information to the server  900 . For example, the usage history information may be the usage history information U 11  of  FIG. 37 , the usage history information U 12  of  FIG. 39 , or the usage history information U 13  of  FIG. 41 . 
     In operation S 5200 , the mobile terminal  700  transmits the event generation information to the server  900 . For example, the mobile terminal  700  may transmit the event generation information including a call reception notification, a message reception notification, or a notification from an application installed in the mobile terminal  700  to the server  900 . 
     In operation S 5340 , the server  900  determines the volume adjusting operation based on the setting information, the usage history information, and the event generation information. In operation S 5400 , the server  900  transmits information about the volume adjusting operation to the electronic device  800 . In operation S 5500 , the electronic device  800  adjusts the volume of the audio signal according to the volume adjusting operation. 
       FIG. 67  is a block diagram of a mobile terminal  1000  according to an exemplary embodiment. 
     Referring to  FIG. 67 , a structure of the mobile terminal  1000  according to the exemplary embodiment may be applied to all of the mobile terminal  100  of  FIG. 1 , the mobile terminal  300  of  FIG. 52 , the mobile terminal  500  of  FIG. 61 , and the mobile terminal  700  of  FIG. 62 . The structure of the mobile terminal  1000  may be applied to various types of apparatuses, such as wearable devices, for example, a mobile phone, a tablet PC, a PDA, an MP3 player, a kiosk, an electronic picture frame, a navigation apparatus, a digital TV, a wrist watch, and a head-mounted display (HMD). 
     Referring to  FIG. 67 , the mobile terminal  1000  may include at least one of a display unit  110 , a controller  170 , a memory  120 , a global positioning system (GPS) chip  125 , a communication unit  130 , a video processor  135 , an audio processor  140 , a user input unit  145 , a microphone unit  150 , an imaging unit  155 , a speaker unit  160 , and a motion detector  165 . 
     The display unit  110  may include a display panel  111  and a controller (not shown) that controls the display panel  111 . The display panel  111  may be realized as any type of display, such as a liquid crystal display (LCD), an organic light-emitting diode (OLED) display, an active-matrix OLED (AM-OLED) display, or a plasma display panel (PDP). The display panel  111  may be flexible, transparent, or wearable. The display unit  110  may be combined with a touch panel  147  of the user input unit  145  to be provided as a touch screen (not shown). For example, the touch screen may include an integrated module in which the display panel  111  and the touch panel  147  are combined in a stacked structure. 
     The memory  120  may include at least one of an internal memory (not shown) and an external memory (not shown). 
     The internal memory may include, for example, at least one of a volatile memory (such as a dynamic random access memory (DRAM), a static RAM (SRAM), or a synchronous DRAM (SDRAM)), a nonvolatile memory (such as a one-time programmable read-only memory (OTPROM), a programmable ROM (PROM), an erasable and programmable ROM (EPROM), an electrically erasable and programmable ROM (EEPROM), a mask ROM, or a flash ROM), a hard disk drive (HDD), and a solid state drive (SSD). According to an exemplary embodiment, the controller  170  may process a command or data received from the nonvolatile memory or at least one of other components by loading the command or data on the volatile memory. Also, the controller  170  may store data received or generated from or by the other components in the nonvolatile memory. 
     The external memory may include, for example, at least one of a compact flash (CF) card, a secure digital (SD) card, a micro-SD card, a mini-SD card, an extreme digital (xD) card, and a memory stick. 
     The memory  120  may store various programs and data used to operate the mobile terminal  1000 . For example, the memory  120  may temporarily or semi-permanently store at least a part of a key generation program and an encryption program for content encryption, and a key restoration program and a decryption program for content decryption. Alternatively, for example, the memory  120  may temporarily or semi-permanently store at least a part of encrypted content and decrypted content. 
     According to the exemplary embodiment, when an event is generated, the controller  170  may determine a volume adjusting operation of an audio signal output from an electronic device based on usage history information of the mobile terminal  1000 . According to an exemplary embodiment, when an event is generated, the controller  170  may determine the volume adjusting operation based on at least one of the usage history information and setting information. 
     For example, the controller  170  may control the display unit  110  such that a part of content stored in the memory  120  is displayed on the display unit  110 . In other words, the controller  170  may display the part of the content stored in the memory  120  on the display unit  110 . Alternatively, when a user gesture is received on one region of the display unit  110 , the controller  170  may perform a control operation corresponding to the user gesture. 
     The controller  170  may include at leas tone of an RAM  171 , an ROM  172 , a central processing unit (CPU)  173 , a graphical processing unit (GPU)  174 , and a bus  175 . The RAM  171 , the ROM  172 , the CPU  173 , and the GPU  174  may be connected to each other via the bus  175 . 
     The CPU  173  accesses the memory  120  and performs booting by using an operating system (OS) stored in the memory  120 . Also, the CPU  173  performs various operations by using various programs, contents, and data stored in the memory  120 . 
     The ROM  172  stores a command set for system booting. For example, when a turn-on command is input and power is supplied to the mobile terminal  1000 , the CPU  173  may copy an OS stored in the memory  120  to the ROM  171  according to a command stored in the ROM  172 , and boot a system by executing the OS. When the system is booted, the CPU  173  copies various programs stored in the memory  120  to the RAM  171 , and executes the various programs copied to the RAM  171  to perform various operations. When the mobile terminal  1000  is booted, the GPU  174  displays a UI screen on a region of the display unit  110 . For example, the GPU  174  may generate a screen displaying an electronic document including various objects, such as content, an icon, and a menu. The GPU  174  calculates attribute values, such as coordinate values, shapes, sizes, and colors, of the objects according to a layout of the screen. Then, the GPU  174  may generate the screen having various layouts including the objects based on the attribute values. The screen generated by the GPU  174  may be provided to the display unit  110  and displayed on a region of the display unit  110 . 
     The GPU  125  may receive a GPS signal from a GPS satellite and calculate a current position of the mobile terminal  1000 . The controller  170  may use the GPS chip  125  to calculate user&#39;s location when a navigation program is used or a current location of the user is required. 
     The communication unit  130  may communicate with any type of external device according to any type of communication method. According to the exemplary embodiment, the communication unit  130  may transmit information about the volume adjusting operation determined by the controller  170  and event generation information to at least one electronic device. Also, the communication unit  130  may further transmit at least one of ID information, usage history information, and event termination information of the mobile terminal  1000 . For example, the communication unit  130  may include at least one of a Wi-Fi chip  131 , a Bluetooth chip  132 , a wireless communication chip  133 , and a near-field communication (NFC) chip  134 . The controller  170  may communicate with various external devices by using the communication unit  130 . 
     The Wi-Fi chip  131  and the Bluetooth chip  132  may respectively perform communication by using a Wi-Fi method and a Bluetooth method. When the Wi-Fi chip  131  or the Bluetooth chip  132  is used, various types of connection information, such as subsystem identification (SSID) and a session key, are first transferred, and then information may be transferred through connection made by using the connection information. The wireless communication chip  133  is a chip that performs communication according to any one of various communication standards, such as IEEE, Zigbee, third generation (3G), third generation partnership project (3GPP), and long term evolution (LTE). The NFC chip  134  is a chip that operates in an NFC method using 13.56 MHz band from among various RFID frequency bands, such as 135 kHz, 13.56 MHz, 433 MHz, 860 to 960 MHz, and 2.45 GHz. 
     The video processor  135  may process video data included in content received through the communication unit  130  or in content stored in the memory  120 . The video processor  135  may perform various image processes, such as decoding, scaling, noise filtering, frame rate converting, and resolution converting, on the video data. 
     The audio processor  140  may process audio data included in content received through the communication unit  130  or in content stored in the memory  120 . The audio processor  140  may perform various processes, such ad decoding, amplifying, and noise filtering, on the audio data. 
     When a reproduction program is executed for multimedia content, the controller  170  may reproduce the multimedia content by driving the video processor  135  and the audio processor  140 . The speaker unit  160  may output audio data generated by the audio processor  140 . 
     The user input unit  145  may receive various commands from the user. According to the exemplary embodiment, the user input unit  145  may receive the setting information regarding adjusting of the volume of the audio signal. For example, the user input unit  145  may include at least one of a key  146 , the touch panel  147 , and a pen recognizing panel  148 . 
     The key  146  may include various types of keys, such as mechanical buttons and wheels, which are formed on various regions, such as a front portion, a side portion, and a rear portion, of an outer body of the mobile terminal  1000 . 
     The touch panel  147  may detect a touch input of the user and output a touch event value corresponding to the touch input. When the touch screen is configured as the touch panel  147  and the display panel  111  are combined with each other, the touch screen may include any type of touch sensor, such as an electrostatic type, a pressure type, and a piezoelectric type. In the electrostatic type, a dielectric material coated on a surface of the touch screen is used to detect micro-electricity induced by the user when a body of the user touches the screen, and a touched coordinate is calculated. In the pressure type, the touch screen includes two electrode plates, and when the user touches the touch screen, a touched coordinate is calculated by detecting a current flowing through the two electrode plates as the two electrode plates touch each other at a touched point. A touch event generated on the touch screen may be mainly generated by a finger of the user, but may alternatively generated by a conductive object that may apply capacitance change to the touch screen. 
     The pen recognizing panel  148  may detect a proximity input or a touch input of a touch pen, such as a stylus pen or a digitizer pen, and output a pen proximity event or a pen touch event. The pen recognizing panel  148  may use, for example, an electromagnetic resonance (EMR) method, and may detect a touch input or a proximity input according to a change of intensity of an electromagnetic field, which is caused as the pen approaches or touches the user input unit  145 . For example, the pen recognizing panel  148  may include an electron inducing coil sensor (not shown) having a grid structure, and an electron signal processor (not shown) providing an alternating signal having a certain frequency sequentially to each loop coil of the electron inducing coil sensor. When a pen including a resonance circuit is located near the loop coil of the pen recognizing panel  148 , a magnetic field transmitted from the loop coil generates a current based on mutual electron induction in the resonance circuit. An induction magnetic field is generated from a coil forming the resonance circuit based on the current, and the pen recognizing panel  148  detects a proximity or touch location of the pen by detecting the induction magnetic field from the loop coil in a signal receiving state. The pen recognizing panel  148  may have a certain area below the display panel  111 , for example, an area capable of covering a display region of the display panel  111 . 
     The microphone unit  150  may receive user&#39;s voice or other sound and convert the user&#39;s voice or other sound to audio data. The controller  170  may use the user&#39;s voice for a phone call operation, or convert the user&#39;s voice to audio data and store the audio data in the memory  120 . 
     The imaging unit  155  may capture a still image or a moving image according to control of the user. A plurality of the imaging unit  155  may be used, such as a front camera and a rear camera. 
     When the imaging unit  155  and the microphone unit  150  are provided, the controller  170  may perform a control operation according to user&#39;s voice input through the microphone unit  150  or user&#39;s motion recognized by the imaging unit  155 . For example, the mobile terminal  1000  may operate in a motion control mode or a voice control mode. In the motion control mode, the controller  170  activates the imaging unit  155  to capture the user, and performs a control operation corresponding to a motion change of the user. In the voice control mode, the controller  170  may analyze the user&#39;s voice input through the microphone unit  150 , and perform a control operation according to the analyzed user&#39;s voice. 
     The motion detector  165  may detect movement of the body of the mobile terminal  1000 . The mobile terminal  1000  may be rotated or tilted in any direction. At this time, the motion detector  165  may use at least one of various sensors, such as a geomagnetic sensor, a gyro sensor, and an acceleration sensor, to detect characteristics of the movement, such as a rotation direction, an angle, and a tilted angle. 
     Although not shown in  FIG. 67 , according to an exemplary embodiment, the mobile terminal  1000  may further include a universal serial bus (USB) port to which a USB connector is connected, various external input ports to which various external terminals, such as a headset, a mouse, an LAN are connected, a digital multimedia broadcasting (DMB) chip that receives and processes a DMB signal, and various sensors. 
     Names of the components of the mobile terminal  1000  described above may be changed. Also, the mobile terminal  1000  according to an exemplary embodiment may include at least one of the components, may not include some of the components, or may include components other than the above components. 
       FIG. 68  is a block diagram of a software structure of the mobile terminal  1000 , according to an exemplary embodiment. 
     Referring to  FIG. 68 , the memory  120  of  FIG. 67  may store an OS that controls resources of the mobile terminal  1000  and application programs for operating applications. The OS may include kernel  121 , middleware  122 , and application program interface (API)  123 . Examples of the OS include Android, iOS, Windows, Symbian, Tizen, and Bada. 
     The kernel  121  may include at least one of a device driver  121 - 1  or a system resource manager  121 - 2 , which manage resources. The device driver  121 - 1  may access and control hardware components of the mobile terminal  1000  in a software way. Accordingly, the device driver  121 - 1  may be classified into an interface and an individual driver module provided by each hardware company. Examples of the device driver  121 - 1  include a display driver, a camera driver, a Bluetooth driver, a shared memory driver, a USB driver, a keypad driver, a W-Fi driver, an audio driver, and an inter-process communication (IPC) driver. The system resource manager  121 - 2  may include at least one of a process manager, a memory manager, and a file system manager. The system resource manager  121 - 2  may perform functions, such as controlling, assigning, or recovering system resources. 
     The middleware  122  may include a plurality of modules that are pre-realized to provide functions commonly required by various applications. Functions of the middleware  122  may be provided through the API  123  such that applications  124  efficiently use resources in the mobile terminal  1000 . The middleware  122  may include at least one of a plurality of modules, such as an application manager  122 - 1 , a window manager  122 - 2 , a multimedia manager  122 - 3 , a resource manager  122 - 4 , a power manager  122 - 5 , a database manager  122 - 6 , a package manager  122 - 7 , a connection manager  122 - 8 , a notification manager  122 - 9 , a location manager  122 - 10 , a graphic manager  122 - 11 , and a security manager  122 - 12 . 
     The application manager  122 - 1  may manage a life cycle of at least one of the applications  124 . The window manager  122 - 2  may manage GUI resources used on a screen. The multimedia manager  122 - 3  may determine formats required to reproduce various media files, and encode or decode the various media files by using codec matching the formats. The resource manager  122 - 4  may manage a resource, such as a source code, a memory, or a storage space, of at least one of the applications  124 . The power manager  122 - 5  may operate together with BIOS to manage a battery or power supply, and provide power supply information required for operating the mobile terminal  1000 . The database manager  122 - 6  may manage a database to be used for at least one of the applications  124 , for example, generate, search, or change the database. The package manager  122 - 7  may manage installing or updating of an application that is distributed in a form of a package file. The connection manager  122 - 8  may manage a wireless connection, such as Wi-Fi or Bluetooth. The notification manager  122 - 9  may display or notify an event, such as a message arrival, a plan, or a proximity notification, such that a user is not interfered. The location manager  122 - 10  may manage location information of the mobile terminal  1000 . The graphic manager  122 - 11  may manage a graphic effect to be provided to the user and a UI related to the graphic effect. The security manager  122 - 12  may provide various security functions required for system security or user authentication. When the mobile terminal  1000  includes a phone function, the middleware  122  may further include a call manager (not shown) for managing user&#39;s voice or a video call function. 
     The middleware  122  may further include a runtime library  122 - 13  or other library modules (not shown). The runtime library  122 - 13  is a library module used by a compiler to add a new function through a programming language while an application is executed. For example, the runtime library  122 - 13  may perform functions regarding input and output, memory management, or arithmetic functions. The middleware  122  may generate and use a new middleware module by combining various functions of internal component modules described above. The middleware  122  may provide a specialized module according to types of an OS to provide a differentiated function. The middleware  122  may dynamically delete some of the components or add new components. According to one or more exemplary embodiments, some of the components may be omitted, other components may be added, or the component may be replaced by another component having a different name but performing a similar function. 
     The API  123  is a group of API programming functions, and may have different structures according to OS. For example, in Android or iOS, one API set may be provided according to platforms, and in Tizen, at least two API sets may be provided. 
     The applications  124  may include a preloaded application installed as a default or a third party application installable by the user. The applications  124  may include, for example, at least one of a home application  124 - 1  for returning to a home screen, a dialer application  124 - 2  for talking to another person on the phone, a text message application  124 - 3  for receiving a message from another person identified by a phone number, an instant message (IM) application  124 - 4 , a browser application  124 - 5 , a camera application  124 - 6 , an alarm application  124 - 7 , a phone book application  124 - 8  for managing phone numbers or addresses of other people, a call log application  124 - 9  for managing a call log of the user, a reception/transmission log of a text message, or a missed call log, an email application  124 - 10  for receiving a message identified as an email from another person, a calendar application  124 - 11 , a media player application  124 - 12 , an album application  124 - 13 , and a watch application  124 - 14 . Names of the components described above may vary according to types of an OS. Also, the software structure may include at least one of the components, may not include some of the components, or may further include an additional component. 
       FIG. 69  is a block diagram of an electronic device  2000  according to an exemplary embodiment. 
     Referring to  FIG. 69 , a structure of the electronic device  2000  according to the exemplary embodiment may be applied to all of the electronic device  200  of  FIG. 1 , the electronic device  400  of  FIG. 52 , the electronic device  600  of  FIG. 61 , and the electronic device  800  of  FIG. 62 . According to an exemplary embodiment, the electronic device  2000  may include a communication unit  210 , a user input unit  220 , a controller  230 , and an audio output unit  240 . According to an exemplary embodiment, the electronic device  2000  may further include a display unit  250 . 
     The communication unit  210  may communicate with at least one mobile terminal to receive event generation information from the at least one mobile terminal. Also, the communication unit  210  may further receive usage history information from the at least one mobile terminal. Also, the communication unit  210  may receive ID information from the at least one mobile terminal and store the ID information to register the at least one mobile terminal in a connection terminal list. 
     According to an exemplary embodiment, the user input unit  220  may receive setting information regarding adjusting of volume of an audio signal. According to an exemplary embodiment, the user input unit  220  may further receive a user input of commanding whether to perform a volume adjusting operation according to the event generation information. 
     According to an exemplary embodiment, when the event generation information is received, the controller  230  may determine the volume adjusting operation based on the setting information. For example, when the event generation information is received, the controller  230  may store the volume of the audio signal at a point of time when the event generation information is received as a first level, and determine to adjust the volume of the audio signal to a second level according to the setting information. 
     According to an exemplary embodiment, when the event generation information is received, the controller  230  may determine the volume adjusting operation based on the setting information and the usage history information. For example, when the event generation information is received, the controller  230  may store the volume of the audio signal at the point of time when the event generation information is received as the first level, and determine to adjust the volume of the audio signal to the second level according to the setting information and the usage history information. 
     According to an exemplary embodiment, when the event generation information is received, the controller  230  may determine the volume adjusting operation based on the setting information and a user input. For example, when the event generation information is received, the controller  230  may store the volume of the audio signal at the point of time when the event generation information is received as the first level, and determine to adjust the volume of the audio signal to the second level according to the setting information and the user input. 
     According to an exemplary embodiment, when event termination information is received from the at least one mobile terminal or forced termination information is received from the user, the controller  230  may re-adjust the volume of the audio signal to the first level. According to an exemplary embodiment, when a first time (i.e., a first time duration) passed after the volume of the audio signal is adjusted to the second level is equal to or higher than a threshold time, the controller  230  may re-adjust the volume of the audio signal to the first level. 
     According to an exemplary embodiment, when event generation information is received from a mobile terminal that is not registered in the connection terminal list, the controller  230  may adjust the volume of the audio signal to a standard level. 
     The audio output unit  240  may output the audio signal according to the volume adjusting operation. The display unit  250  may display the event generation information. 
       FIG. 70  is a block diagram of the server  900  according to an exemplary embodiment. 
     Referring to  FIG. 70 , the server  900  may include a controller  910 , a memory  920 , and a transmitter/receiver  930 . However, not all the components shown in  FIG. 70  are essential. The server  900  may include more or less components than those shown in  FIG. 70 . The components will now be described in detail. 
     The controller  910  may control overall operations of the server  900 . For example, the controller  910  may execute programs (or modules) stored in the memory  920  to determine a volume adjusting operation of an audio signal output from an electronic device. For example, the controller  910  may determine the volume adjusting operation based on setting information regarding adjusting of volume of the audio signal or usage history information of a mobile terminal. 
     The memory  920  may store programs for processes or controls of the controller  910 , and store input/output data, such as the usage history information received from the mobile terminal and the setting information regarding adjusting of the volume of the audio signal. The programs stored in the memory  920  may be classified into a plurality of modules based on functions. 
     The transmitter/receiver  930  may include at least one component to communicate with the mobile terminal or the electronic device. For example, the transmitter/receiver  930  may receive the usage history information from the mobile terminal and transmit information about the volume adjusting operation to the electronic device. 
     The methods described above may be recorded on a computer-readable recording medium by being realized in computer programs executed by using various computers. The computer-readable recording medium may include at least one of a program command, a data file, and a data structure. The program commands recorded in the computer-readable recording medium may be specially designed or well known to one of ordinary skill in the computer software field. Examples of the computer-readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, etc. Examples of the computer command include mechanical codes prepared by a compiler, and high-level languages executable by a computer by using an interpreter. 
     While exemplary embodiments have been described and particularly shown above, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.