The invention concerns a method for determining priority of a data item, the data item being sent from at least one first terminal or service associable with the first terminal to a second terminal and evaluated using a set of first rules associable with the sender of a data item and a set of second rules associable with the recipient of a data item. The invention is characterized in that the data item is associated with at least one tag characterizing the data item, weight factor for the data item is maintained using the set of first rules and the value of the at least one tag, the weight factor of the data item is made adjustable by the set of second rules and the data item is rendered on the second terminal using at least the weight factor information. Also an arrangement implementing the method is disclosed.