A plasma display apparatus is disclosed. The plasma display apparatus includes a plasma display panel for displaying an image by a frame comprising a plurality of subfields, and a driver for, when a vertical frequency of an image signal inputted is less than a critical frequency, dividing the frame into a first subfield group and a second subfield group each comprising one or more subfields, the number of subfields of the first subfield group being different from the number of subfields of the second subfield group, and when the vertical frequency is more than the critical frequency, constituting the frame by a third subfield group comprising one or more subfields.