The invention discloses a method and device for determining related objects. The method for determining the related objects includes the steps that the object types and object themes of objects are determined according to original corpus documents of the objects; the objects are aggregated according to the object types, and one or more object clusters are obtained; the related objects of the to-be-analyzed objects are acquired according to the theme similarity between the objects in the same object cluster. By means of the method and device, the related objects of the to-be-analyzed objects can be automatically determined, and the defects that data analysis is conducted through an experiential analysis method in the prior art, so that too high human cost is caused, and the analysis result is limited by experience of analysts and the market activity range are overcome.