TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The vinyl monomer (A) in the copolymer (B), is chosen from monomer of formula (1):CH2=C(R1)COOR2 (1),monomer of formula (2):and monomer of formula (3):CH2=C(R1)(R2) (3)R1 of formula (1) = H, methyl or cyano;R2 of formula (2) = H, 1-20C alkyl, aryl or their derivatives;R = 1-20C alkyl, aryl, aralkyl or cycloalkyl;R1 of formula (3) = H or methyl;andR2 of formula (3) = substituent such as H, hydroxyl, sulfonic acid, 1-20C alkyl, phenyl, cyclohexyl, cyano, amido, halogen-containing alkyl or their derivatives.The vinyl monomer (A) is monomer which introduces the ionic group, and is aromatic vinyl monomer. The copolymer (B) has three-dimensional crosslinked structure. Preferred Property: The adjuvant which introduces ionic group, has boiling point or decomposition temperature more than polymerization temperature. Preferred Composition: The amount of adjuvant which introduces ionic group in the resin composition, is 1-80 weight% with respect to total amount of the resin composition.Preferred Process: The resin composition is processed using the ionic-group inducing agent, and then the adjuvant which introduces ionic group is removed from the resin composition, to obtain solid-polymer electrolyte. The resin composition is immersed into the mixture formed by adding ionic-group inducing agent to the solvent after removing the adjuvant which introduces ionic group.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The polymer-electrolyte fuel cell uses a fuel containing an organic solvent. EXAMPLE - Styrene (in g) (13), N-cyclohexyl maleimide (9), DVB960 (divinyl benzene) (3), 2,2'-azobisisobutyronitrile (0.05) and propylene carbonate (6), were mixed, stirred, and dissolved uniformly, to obtain monomer composition. The monomer composition was poured between glass plates, polymerized, and polymer was removed, to obtain resin composition. The film formed using the resin composition, had thickness of 190 microns. The film was water washed, and immersed in cleaning liquid containing 1,2-dichloroethane and chlorosulfonic acid (5 wt.%) for 30 minutes, to obtain solid-polymer electrolyte having thickness of 200 microns. The obtained electrolyte had ionic conductivity of 150.1 mS/cm. A polymer-electrolyte fuel cell formed using the electrolyte, had high efficiency and output.