The present invention discloses a method for announcing cross-area link information, where two ends of a cross-area link are respectively a first end node and a second end node, and the first end node and the second end node belong to the same Autonomous System (AS). The method includes: generating, by the first end node, first cross-area link information, where the first cross-area link information includes address information of the first end node, address information of the second end node, area address information of an area where the first end node is located, and area address information of an area where the second end node is located; and sending, by the first end node, the first cross-area link information. The present invention further discloses an apparatus for announcing cross-area link information, and a method, an apparatus and a system for computing a cross-area path. Through technology solutions according to embodiments of the present invention, announcement of the cross-area link information is accomplished, static route configuration is not required, and division of an original area is not changed, which can avoid easy occurrence of mistakes and a slow configuration speed caused by the static route configuration.
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