PROBLEM TO BE SOLVED: To provide a method for accelerating photosynthesis enabling plant bodies to artificially promote photosynthetic activity. SOLUTION: This method for accelerating photosynthesis is provided in order to promote photosynthetic activity of the plants, and comprises giving stimulation from low-frequency of≤1,000 Hz, preferably≤40 Hz to the plants via light, magnetic force or electricity to cultivate the plants. COPYRIGHT: (C)2004,JPO