A method for acquiring context information of a user equipment, comprising the steps of: receiving, by a first network-side device to which a serving cell of a user equipment belongs, a measurement report sent by the user equipment; determining, by the first network-side device, a handover target cell and a candidate cell according to the measurement report and a first neighboring-cell configuration relationship, wherein the measurement report comprises a cell which meets a requirement of a measurement event and is measured by the user equipment, wherein the first neighboring-cell configuration relationship comprises neighboring cells of the first network-side device, and wherein the neighboring cells of the first network-side device comprises neighboring cells of the serving cell of the user equipment; and separately sending, by the first network-side device, context information of the user equipment to a second network-side device to which the handover target cell belongs and a third network-side device to which the candidate cell belongs, wherein the context information is used to re-establish a radio resource control, RRC, connection between the user equipment and the second network-side device or the third network-side device when a handover fails; wherein the determining, by the first network-side device, a handover target cell and a candidate cell according to the measurement report and a first neighboring-cell configuration relationship comprises: selecting, by the first network-side device, from at least one cell reported in the measurement report, a cell that is one of neighboring cells configured in the first neighboring-cell configuration relationship and that has best signal quality as the handover target cell; and selecting, by the first network-side device, from the neighboring cells configured in the first neighboring-cell configuration relationship, at least some neighboring cells except the handover target cell as candidate cells; wherein the context information is further used to: when the user equipment successfully performs random access and before the RRC connection is re-established, instruct the second network-side device to send, according to a second neighboring-cell configuration relationship, updated context information to a fourth network-side device to which at least some neighboring cells of the second network-side device belong. receiving, by a first network-side device to which a serving cell of a user equipment belongs, a measurement report sent by the user equipment; determining, by the first network-side device, a handover target cell and a candidate cell according to the measurement report and a first neighboring-cell configuration relationship, wherein the measurement report comprises a cell which meets a requirement of a measurement event and is measured by the user equipment, wherein the first neighboring-cell configuration relationship comprises neighboring cells of the first network-side device, and wherein the neighboring cells of the first network-side device comprises neighboring cells of the serving cell of the user equipment; and separately sending, by the first network-side device, context information of the user equipment to a second network-side device to which the handover target cell belongs and a third network-side device to which the candidate cell belongs, wherein the context information is used to re-establish a radio resource control, RRC, connection between the user equipment and the second network-side device or the third network-side device when a handover fails; wherein the determining, by the first network-side device, a handover target cell and a candidate cell according to the measurement report and a first neighboring-cell configuration relationship comprises: selecting, by the first network-side device, from at least one cell reported in the measurement report, a cell that is one of neighboring cells configured in the first neighboring-cell configuration relationship and that has best signal quality as the handover target cell; and selecting, by the first network-side device, from the neighboring cells configured in the first neighboring-cell configuration relationship, at least some neighboring cells except the handover target cell as candidate cells; wherein the context information is further used to: when the user equipment successfully performs random access and before the RRC connection is re-established, instruct the second network-side device to send, according to a second neighboring-cell configuration relationship, updated context information to a fourth network-side device to which at least some neighboring cells of the second network-side device belong. selecting, by the first network-side device, from at least one cell reported in the measurement report, a cell that is one of neighboring cells configured in the first neighboring-cell configuration relationship and that has best signal quality as the handover target cell; and selecting, by the first network-side device, from the neighboring cells configured in the first neighboring-cell configuration relationship, at least some neighboring cells except the handover target cell as candidate cells; wherein the context information is further used to: when the user equipment successfully performs random access and before the RRC connection is re-established, instruct the second network-side device to send, according to a second neighboring-cell configuration relationship, updated context information to a fourth network-side device to which at least some neighboring cells of the second network-side device belong.