A picture processing device comprising: a video acquisitor structured to acquire a video of a space in which a person exists, the video being imaged by an imaging device; a video analyzer structured to analyze the acquired video and detect a place where the person has stayed in the space, wherein the video analyzer includes an object recognizer, an object tracker, and a three-dimensional space recognizer, wherein the object recognizer includes a discriminator for the head or the whole body of the person and discriminators for various fixtures existing in the space, wherein the object recognizer is structured to set an accompanying region around the detection region of the person in the frame picture of the video, wherein a region obtained by combining the detection region of the person and the accompanying region set around the person is referred to as a behavior region, wherein the object tracker is structured to track the head or the whole body of the person recognized by the object recognizer, wherein the three-dimensional space recognizer is structured to detect a place where the person has stayed in a three-dimensional space specified by a depth map acquired from the imaging device and to detect a frame picture of the video in which the person is estimated to be in a state of touching the fixture by determining that an overlapping portion occurs between the behavior region of the person and the detection region of the fixture; and a picture constructor structured to construct display pictures that allow all stay places where the person has stayed to be recognized, from start of imaging by the imaging device, wherein in a case where an overlapping portion occurs between the behavior region of the person and the detection region of the fixture, the picture constructor is structured to be in a display mode in which the entire fixture is conspicuous, or a display mode in which only the overlapping portion is conspicuous. a video acquisitor structured to acquire a video of a space in which a person exists, the video being imaged by an imaging device; a video analyzer structured to analyze the acquired video and detect a place where the person has stayed in the space, wherein the video analyzer includes an object recognizer, an object tracker, and a three-dimensional space recognizer, wherein the object recognizer includes a discriminator for the head or the whole body of the person and discriminators for various fixtures existing in the space, wherein the object recognizer is structured to set an accompanying region around the detection region of the person in the frame picture of the video, wherein a region obtained by combining the detection region of the person and the accompanying region set around the person is referred to as a behavior region, wherein the object tracker is structured to track the head or the whole body of the person recognized by the object recognizer, wherein the three-dimensional space recognizer is structured to detect a place where the person has stayed in a three-dimensional space specified by a depth map acquired from the imaging device and to detect a frame picture of the video in which the person is estimated to be in a state of touching the fixture by determining that an overlapping portion occurs between the behavior region of the person and the detection region of the fixture; and a picture constructor structured to construct display pictures that allow all stay places where the person has stayed to be recognized, from start of imaging by the imaging device, wherein in a case where an overlapping portion occurs between the behavior region of the person and the detection region of the fixture, the picture constructor is structured to be in a display mode in which the entire fixture is conspicuous, or a display mode in which only the overlapping portion is conspicuous.