| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection system that can prevent the occurrence of battery replacement in a situation where hands-free is required.SOLUTION: A projection system 1 includes a portable communication terminal 4 and a projector 6 and supplies information from the portable communication terminal 4 to the projector 6 to allow a staff dealing with the case to visually recognize the information in a hands-free way. When the projection system 1 receives case information from a case management device 2, increases an execution frequency of determination as to whether the projector is in an equipment abnormal state according to a distance to an occurrence point of the case as the distance becomes shorter. |
