A method of managing a filter apparatus a filter apparatus positionable outside a washing machine and connectable to a drain device of the washing machine to filter water discharged from the washing machine, the method comprising: storing, by a server, information of the washing machine; registering, by the server, the filter apparatus in association with a user account based on receiving a registration request signal to register the filter apparatus; and transmitting, by the server, the information of the washing machine to the filter apparatus based on the filter apparatus being registered in association with the user account.