TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Agent: The desulfurizing agent contains 50-90 mass% of nickel, and 40 mass% or less of copper as their oxides. Preferred Support: The support contains at least one of silica, alumina and silica-alumina. Preferred Catalyst: The catalyst used for modification is a ruthenium type catalyst or nickel type catalyst. The support component of catalyst used for modification contains manganese oxide, cerium oxide and/or zirconium oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Raw Material: The hydrocarbon raw material and/or oxygen content hydrocarbon raw material is chosen from kerosene oil, light oil, liquefied petroleum gas, naphtha, gasoline, natural gas and dimethyl ether. Preferred Method: The modification method while manufacturing hydrocarbon, is steam modification, partial oxidation modification or autothermal modification. EXAMPLE - Nickel sulfate hexahydrate (in g) (730.2) and copper sulfate pentahydrate (151.3), were dissolved in ion exchange water (8 L) at 80degreesC. Pseudo boehmite (16) was added followed by 1N sulfuric acid (300 ml) and pH was adjusted to 2. A liquid (A) was obtained. Sodium carbonate (600) was dissolved in ion exchange water (8 L) and heated at 80degreesC, to which water glass (180.2) was added and liquid (B) was obtained. The liquids (A) and (B) were mixed at 80degreesC and stirred for 1 hour. The precipitated cake was filtered, washed, dried for 12 hours at 120degreesC and baked at 850 degrees C for 3 hours. The baked products were molded and desulfurizing agent of average particle diameter 0.8 mm was obtained after grinding. The desulfurizing agent had nickel content of 65 mass%, copper content of 15 mass% and alumina-silica content of 20 mass%. The atomic ratio of silicon and aluminum, was 5.6. The desulfurizing agent was maintained at a temperature of 180 degrees C at normal pressure for 6 hours in hydrogen air flow. Temperature was further raised to 300 degrees C over 30 minutes and maintained for 50 hours. Subsequently temperature was reduced to room temperature. Surface oxidation treatment of desulfurizing agent was performed with dilute oxygen of 1% oxygen concentration. The metal crystalline diameter was 3.2 nm and reduction degree was 92%.