An electronic device comprising: a speaker; a touchscreen display; a communication circuit; at least one processor operatively connected to the speaker, the display, and the communication circuit; and a memory operatively connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the processor to: execute a calling application; attempt to connect a call to a service provider using the communication circuit; during call connection to the service provider, receive a first user input requesting a standby mode for connection to an attendant of the service provider, wherein the calling application is executable in a background in the standby mode; in response to the first user input, execute the calling application in the standby mode; while the calling application is being executed in the standby mode, determine whether the attendant is connected based on a voice transmitted by the service provider using a determination model comprising a learned deep-learning model for determining whether the voice transmitted by the service provider is an utterance of an attendant or an announcement previously stored as an automatic response service; output a notification, indicating that the connection to the attendant has been determined, using the speaker or the touchscreen display, and in response to reception of a second user input for the output notification, terminate the standby mode. a speaker; a touchscreen display; a communication circuit; at least one processor operatively connected to the speaker, the display, and the communication circuit; and a memory operatively connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the processor to: execute a calling application; attempt to connect a call to a service provider using the communication circuit; during call connection to the service provider, receive a first user input requesting a standby mode for connection to an attendant of the service provider, wherein the calling application is executable in a background in the standby mode; in response to the first user input, execute the calling application in the standby mode; while the calling application is being executed in the standby mode, determine whether the attendant is connected based on a voice transmitted by the service provider using a determination model comprising a learned deep-learning model for determining whether the voice transmitted by the service provider is an utterance of an attendant or an announcement previously stored as an automatic response service; output a notification, indicating that the connection to the attendant has been determined, using the speaker or the touchscreen display, and in response to reception of a second user input for the output notification, terminate the standby mode. execute a calling application; attempt to connect a call to a service provider using the communication circuit; during call connection to the service provider, receive a first user input requesting a standby mode for connection to an attendant of the service provider, wherein the calling application is executable in a background in the standby mode; in response to the first user input, execute the calling application in the standby mode; while the calling application is being executed in the standby mode, determine whether the attendant is connected based on a voice transmitted by the service provider using a determination model comprising a learned deep-learning model for determining whether the voice transmitted by the service provider is an utterance of an attendant or an announcement previously stored as an automatic response service; output a notification, indicating that the connection to the attendant has been determined, using the speaker or the touchscreen display, and in response to reception of a second user input for the output notification, terminate the standby mode.