A method for supporting content subscription in a content-centric network, wherein the method is applicable to a content network node, the content network node communicates with a content providing device through one or more other forwarding nodes, and the method comprises: receiving, by the content network node, a first interest packet from a user equipment, UE, wherein the first interest packet comprises a first content identifier, and the first content identifier is used to indicate content to be subscribed to by the first interest packet; when a pending interest table, PIT, has a first subscription entry corresponding to the first content identifier, adding, by the content network node, a first port number used in receiving the first interest packet to the first subscription entry, so that a subscription request through a first port represented by the first port number and corresponding to the first content identifier is valid within a first valid duration; receiving, by the content network node, multiple data packets from the content providing device and corresponding to the content indicated by the first content identifier that are forwarded by the one or more other forwarding nodes within the first valid duration; and forwarding, by the content network node, the received multiple data packets to the UE, wherein the enabling the subscription request through the first port represented by the first port number and corresponding to the first content identifier to be valid within the first valid duration comprises: after forwarding the multiple data packets to the UE, keeping, by the content network node, the first port number in the first subscription entry undeleted, and retaining the first port number within the first valid duration. receiving, by the content network node, a first interest packet from a user equipment, UE, wherein the first interest packet comprises a first content identifier, and the first content identifier is used to indicate content to be subscribed to by the first interest packet; when a pending interest table, PIT, has a first subscription entry corresponding to the first content identifier, adding, by the content network node, a first port number used in receiving the first interest packet to the first subscription entry, so that a subscription request through a first port represented by the first port number and corresponding to the first content identifier is valid within a first valid duration; receiving, by the content network node, multiple data packets from the content providing device and corresponding to the content indicated by the first content identifier that are forwarded by the one or more other forwarding nodes within the first valid duration; and forwarding, by the content network node, the received multiple data packets to the UE, wherein the enabling the subscription request through the first port represented by the first port number and corresponding to the first content identifier to be valid within the first valid duration comprises: after forwarding the multiple data packets to the UE, keeping, by the content network node, the first port number in the first subscription entry undeleted, and retaining the first port number within the first valid duration.