To provide a system capable of calculating a presence rate and a network operation rate by using an existing gate managing system and a network managing system.

In this presence rate calculating system 1 for calculating the presence rate of a worker based on the entrance/exist data and log-in/log-out data of an individual M1 obtained from a gate managing system 10 and a network managing system 20, when personal information from the gate managing system 10 is missed, information from the network managing system 20 is supplied so that the presence rate of the worker can be calculated by a managing server 30. In this network operation rate calculating system for calculating the network operation rate, information from the gate managing system 10 is supplied to the personal information from the network managing system 20 so that a network operation rate can be calculated.