8. A transmission method of an image forming apparatus for security transmission of data, the transmission method comprising: extracting text data from data including colors; and transmitting the text data to a management server to obtain transmission permission by determining whether the text data is predetermined protected data that is not to be distributed, and then transmitting the data to a transmission target device according to the transmission permission where the text data is not the predetermined protected data.
12. The transmission method of claim 8 , further comprising: controlling an extraction selection window to be displayed in a predetermined image display device to select the extraction of the text data if the data are the image mixture data.