To attain the reduction of power consumption due to moving image data compressing processing when a low frame rate is set by adjusting the value of frame rate in the image pickup of moving image and the value of frame rate in the compressing processing of moving image data corresponding to operation from the outside.

A CCD camera 203 inputs the moving image according to the frame rate set by a frame rate adjusting means 207 through a frame rate adjust knob and A/D converter 213 converts inputted analog moving image signals to digital moving image data and stores them in the frame memory of video compression/extension circuit 206. In this case, the circuit 206 compresses the moving image data inputted from the camera 203 and transfers them to a communication circuit 208. Then, the operating clock frequency of circuit 206 is controlled to an irreducibly minimum operating clock frequency according to the frame rate set by the adjusting means 207. Besides, when the frame rate is lower than a prescribed value, the circuit 206 is controlled so as not to perform motion compensation.