A method and system for providing washing machine operation information. The system comprises an input unit (10) for inputting a command for washing machine operation control from a user, a controller (20) for generating an operation control signal in response to the command inputted by the input unit (10) to control the operation of a washing machine (1), and processing data regarding a use history and abnormal state of the washing machine, an operation drive circuit (31,32,33) for driving a washing tub in the washing machine and supply/discharge of wash water in response to the operation control signal from the controller (20), a communication unit (40) for supporting a communication function to transmit and receive the data processed by the controller (20) externally over a communication network, a service provider (50) connected to the communication unit (40) for collecting the data from the controller (20), comparison-analyzing the collected data and generating control information for the setup of an optimum washing environment of the machine as a result of the analysis, and an output unit (60) for externally displaying the control information from the service provider and its result processed by the controller. A using pattern of the user or an abnormal state of the washing machine is sensed and managed online, thereby improving the reliability and performance of the machine.