SUBSTRATE PROCESSING METHOD, SUBSTRATE PROCESSING APPARATUS, SUBSTRATE PROCESSING SYSTEM AND RECORDING MEDIUM

A substrate processing method can remove a part of a processing target film formed on a surface of a substrate W under a normal pressure atmosphere while suppressing an influence upon the substrate. A source material of the processing target film, which is decomposed by irradiating an ultraviolet ray thereto under an oxygen-containing atmosphere, is coated on the substrate W, and the processing target film is formed by heating the source material coated on the substrate W. Then, the substrate W having thereon the processing target film is placed within a processing chamber under the oxygen-containing atmosphere where a gas flow velocity is equal to or smaller than 10 cm/sec, and the part of the processing target film is removed by irradiating the ultraviolet ray to the substrate W.