The present invention facilitates optimization of design values of system parameters in designing mobile communication system facilities. The present invention includes a criteria memory storing thresholds of a plurality of system parameters regarding designing of mobile communication facilities, a system parameter calculator for obtaining design values of the system parameters, a determiner for determining evaluation indicators of the system parameters by comparison between the design values and the thresholds, an advice table memory storing advice information corresponding to a combination of the evaluation indicators of the system parameters, a reader for searching the advice table memory and reading the advice information corresponding to the combination, and an output for outputting the read advice information.