In this treatment condition specification method, a recipe information item usable when a substrate W is treated while a treatment liquid discharge position is moved is specified from among a plurality of recipe information items. This treatment condition specification method includes step S31, step S32, and step S33. In step S31, on the basis of measured thickness information including a measurement value of the thickness of a substrate W, predictive thickness information including a predictive value of the thickness of the substrate W after treatment is calculated for each of the recipe information items. In step S32, the predictive thickness information calculated for each of the recipe information items is evaluated in accordance with a predetermined evaluation method, and a predictive thickness information item is selected from among the plurality of predictive thickness information items. In step S33, a recipe information item corresponding to the selected predictive thickness information item is specified. The measurement value included in the measured thickness information indicates the thickness of the substrate W measured before treatment of the substrate W.
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