A digital watermark embedding device and method uses block correlation to perform motion detection on temporally sequential digital video signals after performing preprocessing such as division into blocks. The device and method evaluate a plurality of motion information which are calculated for blocks by using a technique such as determination by majority or weighting. Based on the detected motion information, by moving a digital watermark pattern to follow a picture, the digital watermark information can be superimposed on an input digital video signal so as to match human visual characteristics by using a technique such as emphasizing a portion on which the human eye is easily turned.