An anomaly detection system for detecting an anomaly within a network as a first embodiment in order to provide an anomaly detection system, anomaly detection method, and program for the same. An anomaly detection system which has a plurality of industrial control systems (hereinafter “ICS”s) which are connected to the network, an integrated analyzer which receives the operational status of each ICS as monitoring data in order to identify an ICS for which an anomaly is suspected so as to perform an anomaly assessment, a receiving unit provided for each ICS which receives data from other ICSs, a transmission unit which transmits data to other ICSs and transmits the monitoring data to the integrated analyzer, a security policy which includes recording of data and generation rules, and a wrapper which refers to the security policy in order to control the data so as to transmit the same to other ICSs.