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摘要

PROBLEM TO BE SOLVED: To provide a watermark information embedding device which can embed watermark data without depending on the time information of an MIDI event. SOLUTION: A watermark information embedding device 1 includes an object event extracting means 2 which extracts an object event having a specific parameter from original MIDI data, a target histogram computing means 3 which computes a target histogram on the basis of the object event number extracted by the means 2 and the watermark data, a histogram computing means 4 which classifies the object event extracted by the means 3 on the basis of the parameter and computes a histogram and a parameter changing means 5 which compares the histogram computed by the means 4 and the target histogram and changes the value of the parameter of the object event when the histogram and the target histogram are different.