Electronic device and control method therefor

1. An electronic device comprising:

a display;

a speaker;

an inputter; and

a processor configured to:

control the display to display an image signal inputted through the inputter, control the speaker to output an audio signal synchronized with the displayed image signal,

based on a user command being input, identify a voice signal from an audio signal outputted during a preset previous time based on a point of time of inputting the user command,

perform a voice recognition operation on the voice signal to obtain text information, gender information and age information,

based on the user command including additional information for identifying a character in the image signal, determine caption information corresponding to the additional information based on the obtained text information, wherein the additional information includes gender information and age information, and

control the display to display, on a partial region of the display, a User Interface (UI) including the caption information while the image signal inputted through the inputter is displayed and the audio signal synchronized with the displayed image signal is outputted through the speaker.

2. The electronic device of claim 1 , wherein the user command includes the additional information, and

wherein the processor is further configured to, based on the additional information, identify a voice signal corresponding to the additional information from the audio signal outputted during the preset previous time.

3. The electronic device of claim 1 , wherein the processor is further configured to control the display to display the UI including the caption information corresponding to the audio signal outputted during the preset previous time.

4. The electronic device of claim 3 , wherein the processor is further configured to control the display to display an image signal displayed during the preset previous time along with the caption information.

5. The electronic device of claim 4 , wherein the processor is further configured to, based on the partial region of the display being selected according to a user command, adjust an output volume of the audio signal synchronized with the displayed image signal.

6. The electronic device of claim 5 , wherein the processor is further configured to, based on the partial region of the display being selected according to a user command, control the speaker to decrease the output volume of the audio signal synchronized with the displayed image signal and control the speaker to increase an output volume of the audio signal outputted during the preset previous time.

7. The electronic device of claim 1 , further comprising:

a memory,

wherein the processor is further configured to store an audio signal inputted through the inputter in the memory, and delete, from the memory, an audio signal inputted prior to the preset previous time with respect to a current point of time, among audio signals stored in the memory.

8. The electronic device of claim 1 , further comprising:

a microphone; and

a memory,

wherein the processor is further configured to:

while the audio signal synchronized with the displayed image signal is outputted through the speaker, control the microphone to perform recording,

store a signal recorded through the microphone in the memory, and

obtain a signal recorded during the preset previous time based on a point of time of inputting the user command, among recorded signals stored in the memory, and control the display to display the UI including the caption information based on the obtained signal.

9. The electronic device of claim 1 , wherein the processor is further configured to, based on receiving a user voice command, identify whether the user voice command is the user command to display the UI including the caption information.

10. A method of controlling an electronic device, the method comprising:

displaying an image signal inputted through an inputter on a display of the electronic device;

outputting an audio signal synchronized with the displayed image signal;

based on a user command being input, identifying a voice signal from an audio signal outputted during a preset previous time based on a point of time of inputting the user command;

performing a voice recognition operation on the voice signal to obtain text information, gender information and age information;

based on the user command including additional information for identifying a character in the image signal, determining caption information corresponding to the additional information based on the obtained text information, wherein the additional information includes gender information and age information; and

displaying, on a partial region of the display, a User Interface (UI) including the caption information while the image signal inputted through the inputter is displayed and the audio signal synchronized with the displayed image signal is outputted through a speaker.

11. The method of claim 10 , wherein the user command includes the additional information, and

wherein the method further comprises, based on the additional information, identifying a voice signal corresponding to the additional information from the audio signal outputted during the preset previous time.

12. The method of claim 10 , wherein the displaying the UI including the caption information comprises displaying the UI including the caption information corresponding to the audio signal outputted during the preset previous time.

13. The method of claim 12 , wherein the displaying the UI including the caption information comprises displaying an image signal displayed during the preset previous time along with the caption information.