Image forming system, terminal, server, image forming apparatus and image forming method

The invention provides an image forming system that prevents leakage of confidential data. The confidential-data-transmitting unit of a terminal transmits confidential data (500) that includes imagesor characters specified for confidentiality inside a document of document data (400) to a server. The code-image-acquiring unit of a server acquires a code image (510) for outputting the confidentialdata (500). The confidential-document-data-creating unit of the terminal creates confidential-document data (410) in which the code image (510) is added to the document data (400). The decoding unit of the image forming apparatus decodes the code image (510) from the confidential-document data (411) that includes the code image (510). The code-confidential-data-acquiring unit acquires the confidential data (500) from the code-confidential-data-transmitting unit according to the contents of the code image (510). The output-data-creating unit creates output data (420) in which the confidential data (500) is included in t