Data compression is performed on an original image frame of a display buffer area of the mobile terminal by using a wavelet transform compression algorithm, and after the compressed data is transmitted to the smart television and an inverse wavelet transform decompression processing is performed thereon, the original image frame is restored for display, so as to achieve the content display between the screens of the mobile terminal and the smart television. Existing hardware is used to compress and decompress data, which does not occupy operation resources of the mobile terminal and the smart television, and improves the system performance and accelerates the data compression speed. Also, the adopted wavelet transform compression algorithm can effectively improve the data compression ratio, reduce the data transmission amount in the transmission process, and reduce the hardware overhead.