Is this computer good for maple?

Sorry, I don't know enough about hardware to tell whether the processor you have is higher or lower than what they require.
FWIW, I have computers with much lower specs than Nexon's listed minimum, which play Maple fine most of the time, but they lag to some extent at bosses, Event Hall, and/or crowded areas. I mostly use them for mules.

Also, I'm told that the new 2D skeleton animation system KMS has started using requires even higher specs, especially of the graphic processor (which you haven't listed at all).