A wireless transmission system for transmitting a picture data between a
transmitter and a receiver by wireless communication is provided. Each of
the receiver and the transmitter is equipped with a directional antenna
and a non-directional antenna. A communication of the picture data is
performed by using the directional antennas, and a communication of a
control data indicating a reception status of the picture data is
performed by using the non-directional antennas. The transmitter controls
an intensity of a signal radiated from the directional antenna of the
transmitter based on the control data so that the intensity becomes a
minimum intensity that can transmit the picture data.