Substrate processing apparatus and substrate processing method

A substrate processing apparatus includes: a storage tank configured to store a liquid; a substrate support unit configured to rotatably, horizontally support a substrate; and a plate driving unit configured to move the substrate support unit between an immersion position at which the substrate is immersed into the liquid stored in the storage tank, and a separation position located above the immersion position, at which the substrate is separated from the liquid stored in the storage tank. The substrate processing apparatus also includes a rotary drive unit configured to rotate the substrate supported by the substrate support unit, and liquid supply units configured to supply a liquid to the substrate that is being rotated by the rotary drive unit in the separation position.