An information transmission system, comprising: a power system control center, a network device, a transmission device, and at least one system terminal, wherein the network device belongs to a wide area network, some or all system terminals of the at least one system terminal are configured to send at least one first report message to the transmission device, wherein the at least one first report message is transmitted by using a first network transmission protocol; and the transmission device is configured to send at least one second report message to the power system control center by using the network device based on information in the at least one first report message, wherein the at least one second report message is transmitted by using a second network transmission protocol that is different from the first network transmission protocol; wherein the system further comprises a first information processing device, and the first information processing device is configured to: receive the at least one first report message sent by some or all system terminals of the at least one system terminal; process the at least one first report message based on content or a report time of the at least one first report message to obtain a processed message, wherein the processed message comprises the information in the at least one first report message; send the processed message to the transmission device by using the first network transmission protocol; and correspondingly, in the aspect of sending at least one second report message to the power system control center by using the network device based on information in the at least one first report message, the transmission device is configured to: generate the at least one second report message based on the processed message and the second network transmission protocol; and send the at least one second report message to the power system control center by using the network device. a power system control center, a network device, a transmission device, and at least one system terminal, wherein the network device belongs to a wide area network, some or all system terminals of the at least one system terminal are configured to send at least one first report message to the transmission device, wherein the at least one first report message is transmitted by using a first network transmission protocol; and the transmission device is configured to send at least one second report message to the power system control center by using the network device based on information in the at least one first report message, wherein the at least one second report message is transmitted by using a second network transmission protocol that is different from the first network transmission protocol; wherein the system further comprises a first information processing device, and the first information processing device is configured to: receive the at least one first report message sent by some or all system terminals of the at least one system terminal; process the at least one first report message based on content or a report time of the at least one first report message to obtain a processed message, wherein the processed message comprises the information in the at least one first report message; send the processed message to the transmission device by using the first network transmission protocol; and correspondingly, in the aspect of sending at least one second report message to the power system control center by using the network device based on information in the at least one first report message, the transmission device is configured to: generate the at least one second report message based on the processed message and the second network transmission protocol; and send the at least one second report message to the power system control center by using the network device. receive the at least one first report message sent by some or all system terminals of the at least one system terminal; process the at least one first report message based on content or a report time of the at least one first report message to obtain a processed message, wherein the processed message comprises the information in the at least one first report message; send the processed message to the transmission device by using the first network transmission protocol; and correspondingly, in the aspect of sending at least one second report message to the power system control center by using the network device based on information in the at least one first report message, the transmission device is configured to: generate the at least one second report message based on the processed message and the second network transmission protocol; and send the at least one second report message to the power system control center by using the network device. generate the at least one second report message based on the processed message and the second network transmission protocol; and send the at least one second report message to the power system control center by using the network device.