1. A content screening method, comprising: receiving, by a content screening component, a categorized content, wherein the categorized content comprises: a content category of the categorized content, and information of a first categorization component, wherein the categorized content is categorized by the first categorization component, and the content category is provided by the first categorization component; screening, by the content screening component, the categorized content according to the content category upon the content screening component determining that the first categorization component that categorizes the content is trusted by the content screening component according to the information of the first categorization component; requesting, upon determining by the content screening component that the first categorization component is not trusted by the content screening component, a trusted second categorization component to re-categorize the categorized content, and screening the categorized content according to a returned content category from the trusted second categorization component.