To normally multiplex and transmit encoded data even if the bit rate of picture encoding is changed and information generation quantity is changed by providing a rate controller in a picture encoding part outputting encoded data.

A picture transmission device 7 is constituted by the picture encoding part 8 and a media multiplex part 11 receiving encoded data from the picture encoding part 8 and multiplexing it with other data and transmitting them. The rate controller 10 is provided for the picture encoding part 8 and bit rate information and a reset signal are received from an encoder 9. Then a processing for making the bit rate to be that after a change is executed. An enable gate signal is transmitted to a transmission gate 5 and a data output period signal is outputted to a media multiplex part 11. The media multiplex part 11 is caused to receive encoded data after the bit rate is changed.