A method and an apparatus for introducing information into a living organism reliably and in a way which is unlikely to disturb the original function of the living organism. Information to be introduced into a biogenic DNA is prepared in a step. This information is compressed in the next Step. The compressed data is converted into base sequence data in the next step. The base sequence data has an error correction code inserted thereinto in the next step, has a buffer sequence inserted thereinto in the next Step, and has a sequence for positive selection inserted thereinto in the next step. If the position of introduction is determined in the next step to be a sequence complementary to the untranslated region, then an intron sequence is added. If the position of introduction is determined in the next step to be intron, then the next step is skipped and the position for introduction (which has the least effect on the living organism) is determined in the following step immediately after the skipped step. The present invention may be applied to genetically modified foods.
