The facility houses the Oita prefectural Convention Hall and the Civic Hall of Beppu city in a single cultural complex. It is also composed of an international conference hall and a reception hall assembled in the main building, and a symbolic global tower. A foyer connects the halls that are each given a unique geometrical form.
The Philharmonia Hall and convention hall face each other across the main entrance. The civic hall, seats 1200 people with a four story horseshoeshaped balcony. Mainly intended for acoustical musical performances. The core facility, the convention hall seats up to roughly 4000 people. Furnished with movable terraced seats and 2 moving bridges at the ceiling, it accommodates exhibitions in the parquet and other varieties of arena style events. The international conference hall is housed in a cylindrical building with state of the art installations such as simultaneous interpretation equipment handling 6 languages and a multi-vision of 16 screens. The reception hall is a one room-space seating 900 people enclosed by an oval shaped out-swinging wall. Various stage effect equipments stand by at the glass roof to accommodate parties, assemblies and exhibitions.
The symbolic tower on the east side, is a segment of an imaginary sphere 1 kilometer across, centered at sea level at the center of Beppu Park. The titanium cladding pattern and the structural bracing are all designed around this imaginary center. The virtual sphere is an expression of the activation and symbolic core of the new convention city of Beppu.