Abstract: A security system and a method of providing a security service are provided. The method includes receiving, by a mobile terminal, sensor data from a plurality of sensors included in a first plug-in type sensor module; integrating, by the mobile terminal, the sensor data based on a correlation between pieces of sensor data of the plurality of sensors to generate integrated information; analyzing, based on the integration information, a security situation of a place into which the first plug-in type sensor module is plugged; and providing, by the mobile terminal, a result of the analysis to a user.