A method for realizing video browsing, applied to an IP Multimedia Subsystem video monitoring system which includes a monitoring peripheral unit, an IMS core network and a server, the method comprising: receiving, by the monitoring peripheral unit, a first call request for browsing videos of the monitoring peripheral unit from a monitoring client unit, wherein the first call request is a call request directly routed to the monitoring peripheral unit by the IMS core network when no media session connection exists between the server and the monitoring peripheral unit; enabling (22, 23), by the monitoring peripheral unit according to the first call request, the monitoring client unit to browse the videos of the monitoring peripheral unit via a forwarding by the server, if the number of direct media session connections between the monitoring peripheral unit and other monitoring client units reaches a maximal connection number supported by the monitoring peripheral unit; otherwise, establishing a direct media session connection between the monitoring peripheral unit and the monitoring client unit, so as to enable the monitoring client unit to browse the videos of the monitoring peripheral unit, wherein the method further comprises: after the process that the monitoring peripheral unit enables, according to the first call request, the monitoring client unit to browse the videos of the monitoring peripheral unit via the forwarding by the server, converting media session connections which have already been established between the monitoring peripheral unit and other monitoring client units such that the other monitoring client units browse the videos of the monitoring peripheral unit via the forwarding by the server; wherein the process that the monitoring peripheral unit enables, according to the first call request, the monitoring client unit to browse the videos of the monitoring peripheral unit via the forwarding by the server comprises: interacting, by the monitoring peripheral unit, with the server according to the first call request, guiding the monitoring client unit to initiate a second call request for browsing the videos of the monitoring peripheral unit, so as to make the server send a video stream of the monitoring peripheral unit to the monitoring client unit according to the second call request; wherein the process that the monitoring peripheral unit interacts with the server according to the first call request and guides the monitoring client unit to initiate a second call request for browsing the videos of the monitoring peripheral unit comprises: uploading, by the monitoring peripheral unit, the video stream of the monitoring peripheral unit to the server; returning, by the monitoring peripheral unit, a redirection response to the monitoring client unit according to the first call request, so as to make the monitoring client unit initiate the second call request for browsing the videos of the monitoring peripheral unit according to the redirection response. receiving, by the monitoring peripheral unit, a first call request for browsing videos of the monitoring peripheral unit from a monitoring client unit, wherein the first call request is a call request directly routed to the monitoring peripheral unit by the IMS core network when no media session connection exists between the server and the monitoring peripheral unit; enabling (22, 23), by the monitoring peripheral unit according to the first call request, the monitoring client unit to browse the videos of the monitoring peripheral unit via a forwarding by the server, if the number of direct media session connections between the monitoring peripheral unit and other monitoring client units reaches a maximal connection number supported by the monitoring peripheral unit; otherwise, establishing a direct media session connection between the monitoring peripheral unit and the monitoring client unit, so as to enable the monitoring client unit to browse the videos of the monitoring peripheral unit, wherein the method further comprises: after the process that the monitoring peripheral unit enables, according to the first call request, the monitoring client unit to browse the videos of the monitoring peripheral unit via the forwarding by the server, converting media session connections which have already been established between the monitoring peripheral unit and other monitoring client units such that the other monitoring client units browse the videos of the monitoring peripheral unit via the forwarding by the server; interacting, by the monitoring peripheral unit, with the server according to the first call request, guiding the monitoring client unit to initiate a second call request for browsing the videos of the monitoring peripheral unit, so as to make the server send a video stream of the monitoring peripheral unit to the monitoring client unit according to the second call request; uploading, by the monitoring peripheral unit, the video stream of the monitoring peripheral unit to the server; returning, by the monitoring peripheral unit, a redirection response to the monitoring client unit according to the first call request, so as to make the monitoring client unit initiate the second call request for browsing the videos of the monitoring peripheral unit according to the redirection response.