A security management system comprising: an object detection unit that detects a state of an object within a target booth; an abnormality determination unit that compares a result of the detection of the object with defined states and performs abnormality determination based on a result of the comparison; a shooting unit that shoots an inside of the target booth; and a video control unit that sets a resolution of a video signal to be outputted from the shooting unit based on a result of the abnormality determination, wherein the object detection unit includes: a projection unit that projects a predetermined projection pattern including light portions and dark portions that are alternately arranged into the target booth; a deformation amount calculation unit that acquires a shot pattern by shooting the projection pattern projected into the target booth by using the shooting unit, and, for each location in a horizontal plane in the target booth, obtains a deformation amount of the shot pattern compared with a reference pattern, which is the projection pattern when the projection pattern is projected onto a plane at a predetermined height; and a state output unit that obtains height information on the object for each location in the horizontal plane based on the deformation amount of the shot pattern calculated by the deformation amount calculation unit, and outputs the height information on the object as the state of the object, wherein if the abnormality determination unit determines that the abnormality has occurred when a user does not exist within the target booth, the video control unit outputs the video signal shot by the shooting unit at an intact resolution, and if the abnormality determination unit determines that the abnormality has occurred when a user exists within the target booth and an action of the user is abnormal, the video control unit outputs the video signal at a lowered resolution compared to when the user does not exist within the target booth. an object detection unit that detects a state of an object within a target booth; an abnormality determination unit that compares a result of the detection of the object with defined states and performs abnormality determination based on a result of the comparison; a shooting unit that shoots an inside of the target booth; and a video control unit that sets a resolution of a video signal to be outputted from the shooting unit based on a result of the abnormality determination, a projection unit that projects a predetermined projection pattern including light portions and dark portions that are alternately arranged into the target booth; a deformation amount calculation unit that acquires a shot pattern by shooting the projection pattern projected into the target booth by using the shooting unit, and, for each location in a horizontal plane in the target booth, obtains a deformation amount of the shot pattern compared with a reference pattern, which is the projection pattern when the projection pattern is projected onto a plane at a predetermined height; and a state output unit that obtains height information on the object for each location in the horizontal plane based on the deformation amount of the shot pattern calculated by the deformation amount calculation unit, and outputs the height information on the object as the state of the object, wherein if the abnormality determination unit determines that the abnormality has occurred when a user does not exist within the target booth, the video control unit outputs the video signal shot by the shooting unit at an intact resolution, and if the abnormality determination unit determines that the abnormality has occurred when a user exists within the target booth and an action of the user is abnormal, the video control unit outputs the video signal at a lowered resolution compared to when the user does not exist within the target booth.