TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The copper salt is a salt consisting of Broensted acid obtained by removing hydrogen ion from Broensted acid having a dissociation constant of 10 or less, and copper cation. The Broensted acid is hydrohalide, sulfuric acid, thiocyanic acid, phosphoric acid, carbonic acid, nitric acid, methanesulfonic acid, trifluoromethanesulfonic acid, benzenesulfonic acid, acetic acid, trifluoroacetic acid, pentafluoropropionic acid, acetylacetone, phenol, pentafluorophenol, and/or thiophenol. The copper salt is copper halide, copper sulfate, copper thiocyanate, copper phosphate, copper carbonate, copper nitrate, copper methanesulfonate, copper(I) trifluoromethanesulfonate-benzene complex, copper(I) trifluoromethanesulfonate-toluene complex, copper(II) trifluoromethanesulfonate, copper benzenesulfonate, copper acetate, copper trifluoroacetate, copper pentafluoropropionate, copper(II) acetylacetonate, copper phenolate, copper pentafluorophenolate, and/or copper thiophenolate. The usage amount of copper salt is 0.0001-1 mol with respect to compound (II). Polymerization is carried out in the presence of an amine compound containing two or more tertiary nitrogen atoms, and an aprotic polar solvent. The amine compound is 2,2'-bipyridyl, 1,10-phenanthroline, 1,4,7-trimethyl-1,4,7-triazacyclononane, N,N,N',N'-tetramethylethylenediamine, and/or N,N,N',N'-tetraethylethylenediamine. The usage amount of amine compound is 0.1-100 mol with respect to 1 mol of copper salt. Compound (II) is preferably of formula (III), (IV) or (V).Y'=hydrogen ion, alkali metal ion, or ammonium ion of formula: Y'1-N+(-Y'2)(-Y'4)-Y'3, preferably alkali metal ion;andY'1-Y'4=H or 1-10C hydrocarbyl. Preferred Definitions:    X1,X2=chloro.    EXAMPLE - (In g) disodium 2,5-dichloro-1,4-benzenedisulfonate (0.71), powdery metal copper (0.51), copper(I) iodide (0.038), and N-methyl-2-pyrrolidone (5) were mixed and heated to 150 degrees C in nitrogen atmosphere for 4 hours. After cooling, the obtained sample used analyzed. The product was polyarylene having a weight average molecular weight of 174000 g/mol and a number average molecular weight of 97000 g/mol.