Display apparatus for synchronizing caption data and control method thereof

A method of controlling a display apparatus, the method comprising:

• receiving a signal containing video data of a series of frames and corresponding sound data;
• extracting caption data from the signal;
• extracting the video data and the sound data from the signal;
• buffering the extracted video data;
• converting the extracted sound data into a text through sound recognition;
• comparing the converted text with the extracted caption data, and synchronizing the caption data with frames corresponding to respective caption data among frames of the buffered video data, to display the synchronized frames,
• wherein the converting the extracted sound data comprises:
• transmitting the extracted sound data to a server connected through a network;
• and
• receiving the converted text from the server.

A system comprising a display apparatus and a server,

• wherein the display apparatus comprises:
• a signal receiver configured to receive a signal containing video data of a series of frames and corresponding sound data;
• a first data extractor configured to extract caption data from the signal;
• a second data extractor configured to extract the video data and the sound data from the signal;
• a buffering section configured to buffer the extracted video data;
• a communicator configured to transmit the extracted sound data to the server through a network and receive converted text from the server;
• a synchronizer configured to compare the converted text with the extracted caption data, and synchronize the caption data with frames corresponding to respective caption data among frames of the buffered video data;
• and
• a display configured to display the frames synchronized with the caption data;
• and
• wherein the server is configured to convert the extracted sound data into text and transmit the text to the display apparatus.