1. A method for representing a multiplicity of predecessor relationships between a plurality of first objects and a second object in an OLAP (“Online Analytics Processing”) system comprising: configuring an extraction system to extract first information for a plurality of third objects, the first information indicating a sub-object relation between each of the third objects and one of the first objects; configuring the extraction system to extract second information for a plurality of fourth objects, the second information indicating a sub-object relation between each of the fourth objects and the second object; configuring the extraction system to extract third information, the third information indicating a predecessor relation between each of a plurality of the third objects and each of a plurality of the fourth objects; and performing an extraction process based on the configuration of the extraction system.