A transmitting apparatus comprising: an image obtaining unit configured to obtain first video data having pixel information and having video frames of first dimensions (2840 x 2160), the pixel information including color difference information (U, V) and luminance information; a determination unit configured to determine whether the first video data represents a still video or a moving video; an image conversion unit configured to delete the color difference information (U, V) of at least a portion of pixels of a video frame of the first video data, to rearrange luminance information to fill the places of the deleted color difference information and to delete lines (1,3,5,...2159 - D2) or columns (1,3,...3839 - D32) in the video frame that become vacant so that a video frame (D3, D33) of reduced vertical (1080 - D3) or horizontal (1920 - D33) dimension is obtained, and to divide the video frame of reduced vertical dimension into portions (D4, D34) to obtain second video data comprising video frames (D4, D34) of second dimensions (1920 x 1080) smaller than the first dimensions; an output unit configured to output the second video data (D4, D34), to a transmitter having the second dimensions as maximum frame dimensions of video data which the transmitter is allowed to wirelessly transmit to a receiving apparatus, wherein when it is determined that the first video data is still video, generating third video data (D9, D38) containing only color difference information that has been deleted from the first video data for converting the first video into the second video data, and the ouput unit outputs the second video data and the third video data to the transmitter. an image obtaining unit configured to obtain first video data having pixel information and having video frames of first dimensions (2840 x 2160), the pixel information including color difference information (U, V) and luminance information; a determination unit configured to determine whether the first video data represents a still video or a moving video; an image conversion unit configured to delete the color difference information (U, V) of at least a portion of pixels of a video frame of the first video data, to rearrange luminance information to fill the places of the deleted color difference information and to delete lines (1,3,5,...2159 - D2) or columns (1,3,...3839 - D32) in the video frame that become vacant so that a video frame (D3, D33) of reduced vertical (1080 - D3) or horizontal (1920 - D33) dimension is obtained, and to divide the video frame of reduced vertical dimension into portions (D4, D34) to obtain second video data comprising video frames (D4, D34) of second dimensions (1920 x 1080) smaller than the first dimensions; an output unit configured to output the second video data (D4, D34), to a transmitter having the second dimensions as maximum frame dimensions of video data which the transmitter is allowed to wirelessly transmit to a receiving apparatus, wherein when it is determined that the first video data is still video, generating third video data (D9, D38) containing only color difference information that has been deleted from the first video data for converting the first video into the second video data, and the ouput unit outputs the second video data and the third video data to the transmitter.