Recently, smart devices has been spreaded and the definition of RFID/USN(Radio FrequencyIdentification/Ubiquitous Sensor Network) technology has also extended. So, originally, human is an agentof communications but now, ''the things'' are also an agent of communication. That is, Internet ofThings(IoT). IoT is very big IT infra technology that is based on wire-wireless network technologiessuch as Bluetooth and Wi-Fi. However, in reality, IoT service that can provide various meaning andintegrate smoothly is not appear yet. To solve these problems of IoT, we implemented Publish/Subscribesystem, which operate in Zigbee based wireless sensor network by using MQTT-SN protocol. Moreover,this system can operate with combining MQTT system that is already existed in external Internet networkso, extensibility and flexibility aspect is excellent. We show that possibility of IoT services that is combinedbetween different heterogeneous network through the MQTT-SN.