A method for updating system information, comprising: acquiring, by a terminal, at least one piece of indication information sent by a network side device, the at least one piece of indication information being configured to indicate that at least one system information group is updated, the at least one system information group being in one-to-one correspondence with the at least one piece of indication information, and each system information group of the at least one system information group comprising at least one piece of system information; determining, by the terminal, at least one piece of updated target system information in the at least one system information group; and acquiring, by the terminal, the at least one piece of updated target system information; wherein the method further comprising: receiving, by the terminal, a first configuration message, the first configuration message comprising a corresponding relationship between an indication message corresponding to a system information group and a first transmission resource for transmitting the indication message, or, the first configuration message comprising a corresponding relationship between an indication message corresponding to a system information group and a first network temporary identity corresponding to the indication message; wherein the at least one system information group comprises a second system information group, at least one piece of system information comprised in the second system information group belongs to private system information, and the at least one piece of indication information comprises second indication information for indicating that the second system information group is updated, the private system information is system information based on a terminal or a terminal service. acquiring, by a terminal, at least one piece of indication information sent by a network side device, the at least one piece of indication information being configured to indicate that at least one system information group is updated, the at least one system information group being in one-to-one correspondence with the at least one piece of indication information, and each system information group of the at least one system information group comprising at least one piece of system information; determining, by the terminal, at least one piece of updated target system information in the at least one system information group; and acquiring, by the terminal, the at least one piece of updated target system information; wherein the method further comprising: receiving, by the terminal, a first configuration message, the first configuration message comprising a corresponding relationship between an indication message corresponding to a system information group and a first transmission resource for transmitting the indication message, or, the first configuration message comprising a corresponding relationship between an indication message corresponding to a system information group and a first network temporary identity corresponding to the indication message; wherein the at least one system information group comprises a second system information group, at least one piece of system information comprised in the second system information group belongs to private system information, and the at least one piece of indication information comprises second indication information for indicating that the second system information group is updated, the private system information is system information based on a terminal or a terminal service.