Coating treatment apparatus and coating treatment method

A coating treatment apparatus for applying a coating solution to a front surface of a substrate, comprising:

• a plurality of coating solution supply nozzles, one coating supply nozzle for applying a different coating solution containing a solvent from a coating solution of another of said plurality of coating solution supply nozzles onto the front surface of the substrate;
• a plurality of solvent supply nozzles, one solvent supply nozzle for supplying a different removal solvent having a different solubility parameter from the solubility parameter of a removal solvent of another solvent supply nozzle a peripheral portion of the substrate, at the time of edge rinse to remove the coating solution on the peripheral portion of the substrate;
• and
• a system controller programmed to identify the one solvent supply nozzle for use at the time of the edge rinse from among said plurality of solvent supply nozzles, based on the solubility parameter of the solvent in the coating solution to be applied by said one coating supply nozzle and on the solubility parameter of the removal solvent to be supplied from said one solvent supply nozzle, and
• said apparatus further comprising a nozzle setting unit for setting one of said plurality of a solvent supply nozzles for use at the time of the edge rinse from among said plurality of solvent supply nozzles, based on the information of said one solvent supply nozzle identified by said system controller.