FYI, FFXI isn't exactly the best game for learning the language... most of the terms used in the games are just English terms, spelt out in katakana.
But anyways, if I remember correctly, the menu in the JP version has the same layout as the US version. It's just using the standard controller scheme (O = confirm and X = cancel, etc) that's also on NA PC version of the game instead of the NA PS2 scheme.