The embodiment of the invention discloses an information processing method, user side equipment and network side equipment, and the method comprises the steps: obtaining indication information which is used for indicating at least one of the identification and packet header information of a specified data packet, wherein the specified data packet is a data packet for safety configuration conversion. By identifying a data packet or the packet header information, security configuration conversion is controlled to carry out from the specified data packet so that user-side equipment or network-side equipment can encrypt or decrypt the corresponding data packet in time by adopting the corresponding encryption mode and decryption mode. The phenomenon that data (or data packets) are lost due to the fact that a PDCP entity, an RLC entity, an MAC entity and the like need to be reset or reconstructed when a service node is converted (or changed) is avoided, and the safety in the data transmission process is guaranteed.