1. A method for recording an attendance, comprising: receiving, by a Femto, a registration request or a de-registration request of a mobile terminal, wherein the registration request or the de-registration request comprises an identifier of the mobile terminal; and saving, by the Femto, the identifier of the mobile terminal and time corresponding to the registration request or the de-registration request of the mobile terminal together to serve as an attendance record of a user corresponding to the mobile terminal.