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Nowadays, many researches are geared towards RFID and mobile technology which are one of the core technologies for realizing ubiquitous computing. In Korea, mobile RFID network services are developed and operated by using mobile networks and mobile devices with a built-in RFID reader. In this paper, we propose a new method of applying RFID middleware based on ALE to mobile RFID network services. For this, we explain a method of mobile RFID code conversion to handle effectively the code in ALE-compliant middleware. By using the proposed method in a mobile RFID network model, application developers and/or contents industries can gather the information from the users of mobile RFID devices in real-time or periodically. Furthermore, it can provide personalized services to users by utilizing it. In this way, we can easily extend ALE-compliant middleware to process not only general but also mobile RFID code.