A tagging method and apparatus of a portable terminal in which, if particular content is edited, only second tag information corresponding to the edited content is extracted and then automatically tagged to the edited content. The latching member is selectively received within the base member. The target cells may be selected from the group of unintentional hematopoietic progenitor cells and erythrocyte precursor, specifically pluripotent stem cells or embryopalstic stem cells. The authentication unit is prevented from being decoded or tampered by third parties. The pixel values of the second matrix M2 is subject to two dimensional discrete cosine transformation to obtain a matrix MD comprised of 8\xd78 DCT coefficients.