The present invention relates to a process for producing compost, characterized in that when the compost is produced by inoculating aerobic composting seed bacteria to an organic waste material, the process comprises: supplying oxygen while the waste material is stirred, and supplying water so that the water content of the waste material is 60null5%, and to a process for producing compost, characterized in that when the compost is produced by inoculating aerobic composting seed bacteria to an organic waste material, the process comprises, after begining of the fermentation, adding sugars to the waste material in a divisional manner before a main fermentation is transferred to the amine/ammonium metabolic system. Further, according to the present invention, an apparatus for producing compost is provided. The apparatus comprises: a fermentation vessel having an oxygen supplying means, a water distributing means, and a stirring means; and a control means for detecting or determining the moisture content of an organic waste material contained in the fermentation vessel to control, on the basis of the detected or determined result, the amount of water to be distributed by the water distributing means. According to the present invention, when organic waste materials disposed from food processing factories and the like is processed to produce compost of high quality, formation of ammonium and amines mainly causing unpleasant odors or generation of lower fatty acid which is a factor for a growth inhibition of plants can be suppressed, and the compost can be produced in stable, and within a short period of time.