An indication method, comprising: receiving, by first user equipment, a first message sent by second user equipment, wherein the first message comprises information indicating that the second user equipment supports an evolved user equipment-to-network relay function, and wherein the first message is a device-to-device discovery message, the discovery message comprises first indication information indicating that the second user equipment is an evolved user equipment-to-network relay; and subsequently receiving, by the first user equipment, a second message sent by a network device, wherein the second message comprises information indicating that the network device supports an evolved user equipment-to-network relay, or the second message comprises information indicating that a cell in which the network device sends the second message supports an evolved user equipment-to-network relay, wherein the second message comprises first configuration information of the first user equipment and second configuration information of the second user equipment, wherein the second configuration information comprises a first threshold, and the first threshold is used to indicate that the second user equipment is allowed to send the first message to the first user equipment when a Reference Signal Received Power, RSRP, of a Uu link of the second user equipment is higher than the first threshold and wherein the first configuration information includes a second threshold, wherein the second threshold is used to indicate that the first user equipment is allowed to send an evolved user equipment-to-network relay discovery solicitation message when a RSRP of a Uu link of the first user equipment is lower than the second threshold. receiving, by first user equipment, a first message sent by second user equipment, wherein the first message comprises information indicating that the second user equipment supports an evolved user equipment-to-network relay function, and wherein the first message is a device-to-device discovery message, the discovery message comprises first indication information indicating that the second user equipment is an evolved user equipment-to-network relay; and subsequently receiving, by the first user equipment, a second message sent by a network device, wherein the second message comprises information indicating that the network device supports an evolved user equipment-to-network relay, or the second message comprises information indicating that a cell in which the network device sends the second message supports an evolved user equipment-to-network relay, wherein the second message comprises first configuration information of the first user equipment and second configuration information of the second user equipment, wherein the second configuration information comprises a first threshold, and the first threshold is used to indicate that the second user equipment is allowed to send the first message to the first user equipment when a Reference Signal Received Power, RSRP, of a Uu link of the second user equipment is higher than the first threshold and wherein the first configuration information includes a second threshold, wherein the second threshold is used to indicate that the first user equipment is allowed to send an evolved user equipment-to-network relay discovery solicitation message when a RSRP of a Uu link of the first user equipment is lower than the second threshold.