Context updating method, system and device

The invention discloses a context updating system, comprising a home terminal uncompressing device and an opposite terminal compressing device. The home terminal uncompressing device is used for sending a second passive feedback to the opposite terminal compressing device when it is required to send a first passive feedback to the opposite terminal compressing device and the quantity of the firstuncompressing context is larger than or equal to the set first threshold. The opposite terminal compressing device is used for updating the first compressing context in the opposite terminal compressing device and sending the data compressing package carrying the updated context to the home terminal uncompressing device after receiving the second passive feedback. The home terminal uncompressing device is also used for updating the first uncompressing context by means of the updated context carried in the data compressing package succeeding in decompression after the data compressing package carrying the updated context sent by the opposite terminal compressing device is succeeded in decompression. The invention also discloses a context updating method and a context updating device.