In R as you know, when it have been written: summary(lm(x~y)), the command gives a lot of different ‘mystic’ values. I have found a good manual for interpreting the result. It is here
Besides, do not forget lm command is relevant with “regression” model. If you want to compute the simple correlation between two parameter use cor(x,y) command.
If you do not have any idea about difference, here is good article for you