in order to provide information for making a decision when using composite services , there are provided means for calculating evaluation of combinations of services and means for visualizing the evaluations are provided . for this purpose , a method applied to a system having storage means includes receiving a selection of a plurality of service groups from one user ; and computing an evaluation of combinations of services composed by selecting one service from among respective service groups of the plurality of service groups selected , based on evaluation information stored in the storage means .