The development of wireless technologies, such as 3G and Wi-Fi, and the rapid growth of mobile devices equipped with sensors have enabled the practical use of Mobile Participatory Sensing (MPS). By gathering and utilizing sensor data using mobile devices, the deployment cost of services can be reduced. In the context of MPS, it is important to establish a method of storing and locating sensor data collected by millions of mobile devices. In this paper, the development of a sensor data repository system for a large-scale MPS platform is proposed. By storing sensor information in the mobile device's storage, the storage cost can be distributed. The proposed method of tracking the acquisition locations of sensor data can reduce management costs. In addition, a cache mechanism that can minimize duplicate transmissions of sensor data from mobile devices due to overlapping queries is introduced. Based on a two-day simulation, the proposed method can reduce the management cost of the acquisition locations by 80%. Furthermore, the cache method can reduce the transmission of duplicated sensor data on mobile devices. © 2013 ACM.