Image forming apparatus and image forming system comprising the same and printing method thereof

An image forming apparatus connected to at least one terminal device via a network, the image forming apparatus comprising:

• an interface unit to receive print data from the at least one terminal device;
• a control unit to obtain print output information using the type of the received print data;
• and
• a printing unit to change a print concentration of the print data according to the obtained print output information and to print the print data according to the changed print concentration.

A computer-readable medium to contain computer-readable codes as a program to execute a method of an image forming system, the method comprising:

• receiving print data from the at least one terminal device;
• obtaining print output information using a type of the received print data;
• and
• changing a print concentration of the print data according to the obtained print output information and printing the print data.

An image forming system comprising:

• a terminal device to generate print data;
• and
• an image forming apparatus to print the print data,
• wherein print output information is obtained using a type of the print data, and a print concentration is changed according to the print output information such that the image forming apparatus prints the print data according to the changed print concentration.