An oven with a spaying device for roasting meats is disclosed, comprising: a housing 11; an outer pot 12; an inner pot 10; a cover 4 of oven; electric heating elements 8 surrounding the outer surface of the outer pot 12; heat insulating materials 13 inserted between the housing 11 and the outer pot 12; and a control panel 16. The receptacle is provided with an optical connection part on the deep side of the housing space and an electric connection part more frontward than the optical connection part. At least one float is attached to the edge of the bag and a drain is located away from the edge. Thus, large data sets such as that related to Web relevance ranking can be processed.