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This paper introduces a monitoring system, USS monitor for a collaborative ubiquitous computing environment where the applications collaborate to achieve a service goal. We design USS monitor concerning the visualization of the collaboration and the variability of the applications in the main. The monitoring system includes the mechanisms to collect and visualize the state of the member applications for collaboration as well as the resource state of the machines. In addition, concerning the variability of the applications in the ubiquitous computing environment, we design an interaction protocol and the scalable message format between the monitor and the monitored entities. USS monitor is a set of processes and implemented using Java and C. It is operating in the testbed for collaborative ubiquitous computing environment.