How to plot response surface while there are more than one corresponding response value for each coordinates ?

Hi all, I am in trouble at plotting response surface. What I want to do is that I have two design parameters and each has three levels (let say 1,2,3). There is also one response (output) variable that shows the affects of combination of two design parameters such as (parameter1 = 1, parameter = 2 -> output = 5). However, for each combination of parameters, I have about 108 response value. I want to plot response surface this type of experimentation.

Thank you for help, Burak.