Abstract: A data processing apparatus for propagative correlation can include a memory to store a raw matrix with object identifiers and actor identifiers, in the presence or absence of a quantified matrix element, and a background module to convert the raw matrix into reclassified matrix blocks as a function of a criterion linked to the quantified matrix element. The data processing matrix can also include a selection manager to search for an input actor identifier in a first table, the links of which associate an actor identifier and one or more matrix blocks, and to present information depending on the contents of the associated matrix block or blocks. The background module can also include a cross-classifier to convert the raw matrix of the matrix element and a value matrix of the matrix element. The selection manager operates on the basis of the reclassified matrix blocks.