A communication performance calculation method in a mobile communication system which includes a plurality of base stations and a plurality of mobile stations for carrying out communication with the base stations, wherein an area where the mobile stations are distributed is divided into a plurality of subdivisions, said communication performance calculation method comprising:
- a transmission power data storing step of storing, for each of the plurality of subdivisions, transmission power data of a base station corresponding to the subdivision, of a mobile station visiting the subdivision, or of both a base station corresponding to the subdivision and a mobile station visiting the subdivision;
- a traffic intensity data storing, step of storing, for each of the plurality of subdivisions, traffic intensity data of the subdivision;
- a traffic calculating step of calculating a mean and variance of applied traffic at a single base station from the transmission power data and the traffic intensity data of the plurality of subdivisions;
- and
- a communication performance calculating step of calculating communication performance from the mean and variance.