An imaging apparatus for encoding a moving picture signal output by imaging means using intraframe encoding and interframe encoding. An encoded image signal which includes picture groups comprising n frames of an image signal including intraframe-encoded pictures and interframe-encoded pictures is generated. An instruction starts a recording of the encoded image signal. The encoded image signal is transmitted to an external device while the signal is in an encoded state and the encoded image signal is transmitted to an external device while the encoded image signal is not being recorded. Upon detection of the instruction during transmission of the encoded image signal to the external device, recording of the encoded image signal starts, from the leading end of a picture group that contains a frame, corresponding to the instruction.