Abstract: A load on a wireless communication system is measured without monitoring communication in a network by acquiring a serving cell RSRP indicating a reception strength of a reference signal received from one cell of an LTE system, an RSRQ indicating a reception quality of the reference signal, and a non-serving cell RSRP indicating a reception strength of a reference signal received from another cell other than the one cell, that are measured within the one cell, and deriving, based on the serving cell RSRP, the RSRQ and the non-serving cell RSRP, an estimate value of at least any of a PRB utilization ratio in the one cell and a PRB average utilization ratio in the one cell and the other cell.