There is provided a developing apparatus and a developing method capable of rapidly forming a liquid film of a developing solution on an entire surface of a substrate while reducing a usage amount of the developing solution. The developing apparatus includes an airtightly sealed processing vessel that forms a processing atmosphere therein; a temperature control plate that is provided within the processing vessel and mounts the substrate thereon; an atmosphere gas supply unit that supplies an atmosphere gas including mist and vapor of a developing solution onto a surface of the substrate within the processing vessel; and a first temperature control unit that controls the temperature control plate to a temperature allowing the atmosphere gas to be condensed on the substrate. Here, an inner wall of the processing vessel is maintained at a temperature at which the atmosphere gas is hardly condensed on the inner wall.