The invention discloses a method and equipment for informing key data. The method comprises the following steps that when a KS (key server) deletes the key data, a first PUSH message is generated, an SA load of the first PUSH message carries all local key data and a GAP load, and the GAP load carries an UPDATE attribute; the KS sends the first PUSH message to a GM (group member), and the GM updates the local key data of the GM by using all the key data carried in the SA load of the first PUSH message. By the embodiment of the invention, occupancy and consumption of resources of the KS are reduced, and a Delete load is not required to be carried in the PUSH message.