simple. should you own the discs, it says so in the front of the jeweled box
it's not very clear here, but it's below the PS symbol on the upperleft corner., the rectangular white box.
if it's a psn downloaded title, then it should be according to region, but i've never downloaded one nor i think the psp itself has "PAL regions" . My guess it is NTSC in this case since the psp doesnt run its games in PAL, i think.