A server, a washing machine, and a washing system including the same are provided. The washing system includes a washing machine and a server configured to receive turbidity information of washing water from the washing machine at pre-set time intervals, identify an amount of change in turbidity information of the washing water for the pre-set time intervals based on the received turbidity information, predict turbidity information of the washing water based on the amount of change in turbidity information of the washing water, and transmit a control signal for controlling a washing cycle of the washing machine based on the predicted turbidity information of the washing water.