Display device and method of operating the same

A display device comprising:

• a memory storing one or more instructions;
• and
• at least one processor configured to execute the one or more instructions stored in the memory to:
• obtain a first character string by using a character recognition model to determine whether there is at least one character on a play screen of content and recognizing a character string including the at least one character as the first character string in response to determining that there is the at least one character on the play screen of the content,
• obtain a second character string including at least one character by using a speech recognition model to determine whether there is speech in audio data included in a play section of the content where there is the at least one character, and recognizing the speech and converting the recognized speech into a character string as the second character string in response to determining that there is the speech in the audio data,
• compare the first character string with the second character string,
• update the character recognition model based on a mismatch between the first character string and the second character string indicated by the comparing of the first character string with the second character string, and
• use the updated character recognition model to obtain a subsequent character string.