Abstract: A method, a data network arrangement and a computer program product, by means of which a comparator can be implemented in a data network, in which comparator a possibility of online chat can also be utilised. The comparator user stores his evaluation of the properties included in the targets being evaluated in a database in the server in the data network by using a graphic one- or two-dimensional evaluation frame. In the comparator the comparator user's evaluations are compared to property values set for each target being evaluated. During the comparison the comparator analyses the data entered into the comparator by the comparator user against predetermined online chat threshold values. If even one online chat threshold value is exceeded, it is in the comparator according to the invention possible to offer the comparator user an online chat with the service provider's customer servant in order to support the decision-making.