A method and an apparatus for adjusting the parameters of a magnetic resonance image are disclosed. An embodiment of the invention provides a method for adjusting a parameter at an imaging device that includes: (a) obtaining and storing MR (magnetic resonance) data; (b) calculating a constant by using the MR data; and (c) outputting a magnetic resonance image having a different contrast in real time, when a user manipulation is inputted, by using the constant and a parameter adjusted according to the manipulation.