The invention provides a soldering apparatus, a computer-readable medium and a soldering method. The soldering apparatus (100) comprises a receiving part (171) and a deriving part (172), wherein the receiving part (171) receives input of gerber data of a substrate (PL) and reference coordinate values which represent the position of a specified part (PB0) in the substrate (PL). The deriving part (172) extracts a differential coordinate value which represents the position of a to-be-welded part in the substrate (PL) relative to the specified part (Pb0), and derives the coordinate value of the part by means of the extracted differential coordinate value of the part and a reference standard value. In this way, it is possible to reduce the workload of the user when programming the soldering apparatus to perform a soldering process.