Productivity improvement and stress reduction by the information presented to workers

System surveillance is a function required for continuous operation of a system which consists of various apparatus and networks. Many service providers try to raise their productivity. Their methods are to show some information to a operator after alarm occurs. As another method of the rationalization, a surveillance system shows some information to the operator in the waiting time before alarm occurs. This study evaluates the difference in productivity and stress of the work by way of the use of the waiting time. This will reveal the appropriate usage of waiting time. We have built the simulated environment of surveillance system and compared 12 subjects. Operators are working efficiently most in the type which displays the information. Display of information about the indication of operation is enhanced subjects of stress. Display of information to encourage voluntary browsing is allowed to relax the subject. It is an effective method of a productivity improvement and stress reduction to display the information that encourage voluntary browsing on waiting time.