A server (810, 910, 1010, 1110, 1210, 2100) for changing a mode, the server comprising: a receiver configured to receive, from a master device (800, 900, 1000, 1100, 1200), first information related to whether a mode synchronization is activated between the master device and a slave device, and second information related to a rule for supporting a changed mode at the slave device; a transmitter configured to transmit, to the slave device (1220, 1230), the second information; wherein the receiving unit is further configured to receive, from the master device (800, 900, 1000, 1100, 1200), third information related to a changed mode of the master device after receiving the second information; a controller configured to, identify the slave device (1220, 1230) to perform the mode synchronization with the master device based on the first information and generate fourth information based on the second information and the third information; and wherein the transmitter is further configured to, transmit, to the slave device (1220, 1230), the fourth information; wherein the fourth information comprises the information related to the rule for supporting the changed mode at the slave device and the information related to the changed mode of the master device, wherein, the changed mode of the master device is at least one of a Wi-Fi mode, an airplane mode, a sleep mode, a manner mode that indicates one of a ringer mode and a silent mode, and a roaming mode, and wherein the first information and the second information are device context profile, DCP information, and the third information and the fourth information are changed DCP information. a receiver configured to receive, from a master device (800, 900, 1000, 1100, 1200), first information related to whether a mode synchronization is activated between the master device and a slave device, and second information related to a rule for supporting a changed mode at the slave device; a transmitter configured to transmit, to the slave device (1220, 1230), the second information; wherein the receiving unit is further configured to receive, from the master device (800, 900, 1000, 1100, 1200), third information related to a changed mode of the master device after receiving the second information; a controller configured to, identify the slave device (1220, 1230) to perform the mode synchronization with the master device based on the first information and generate fourth information based on the second information and the third information; and wherein the transmitter is further configured to, transmit, to the slave device (1220, 1230), the fourth information; wherein the fourth information comprises the information related to the rule for supporting the changed mode at the slave device and the information related to the changed mode of the master device, wherein, the changed mode of the master device is at least one of a Wi-Fi mode, an airplane mode, a sleep mode, a manner mode that indicates one of a ringer mode and a silent mode, and a roaming mode, and wherein the first information and the second information are device context profile, DCP information, and the third information and the fourth information are changed DCP information.