A method and apparatus are provided for transmitting wireless power in a wireless power network managed by a wireless power transmitter. The method includes transmitting a command signal, at stated periods, that controls the first wireless power receiver to report power information to the wireless power transmitter; determining whether a report signal corresponding to the command signal is received from the first wireless power receiver; and determining that the first wireless power receiver is removed from the wireless power network, when the report signal is not received from the first wireless power receiver after transmitting the command signal a predetermined number of times at the stated periods.