To suppress image deterioration in occurrence of the erroneous transmission of the moving image communication of a video telephone, etc.

In media separation processing, when detecting an error in an image signal, a specific code is inserted and an image decoding part 107 is informed of an error occurring position by the unit of a packet. When detecting the specific code in the received image signal, the part 107 displays an image which can be decoded by the time just before the occurrence of an error and makes a period from the time just after the occurrence of the error to the detection of the next synchronous word.