A dish washer, comprising: at least one chamber for accommodating a to-be-processed object and at least one door for closing the chamber; a collection module, at least for collecting a time signal when the door is opened; a controller, connected to the collection module to receive and analyze the time signal generated by the collection module when the door is opened, count a high-frequency time segment and/or a low-frequency time segment when the door is opened in a predetermined time period T1, wherein the controller is configured to receive and analyze the time signal generated by the collection module when the door is opened, and count an average time segment when the door is opened in the predetermined time period T1, wherein when a time segment is greater than the average time segment by a preset multiple A, the time segment is the high-frequency time segment, or wherein the predetermined time period T1 comprises a last N units of time, the collection module is configured to collect time signals when the door is opened in the last N units of time, and the controller is configured to receive and analyze the collected time signals to count a high-frequency time segment and/or a low-frequency time segment of using the dishwasher per unit of time, and generate a control signal for controlling an operation state of a drying module; and the drying module, connected to the controller to receive the control signal for controlling operation of the drying module, wherein the controller is configured to control the drying module to operate in the low-frequency time segment and to be in a non-operation state in the high-frequency time segment. at least one chamber for accommodating a to-be-processed object and at least one door for closing the chamber; a collection module, at least for collecting a time signal when the door is opened; a controller, connected to the collection module to receive and analyze the time signal generated by the collection module when the door is opened, count a high-frequency time segment and/or a low-frequency time segment when the door is opened in a predetermined time period T1, wherein the controller is configured to receive and analyze the time signal generated by the collection module when the door is opened, and count an average time segment when the door is opened in the predetermined time period T1, wherein when a time segment is greater than the average time segment by a preset multiple A, the time segment is the high-frequency time segment, or wherein the predetermined time period T1 comprises a last N units of time, the collection module is configured to collect time signals when the door is opened in the last N units of time, and the controller is configured to receive and analyze the collected time signals to count a high-frequency time segment and/or a low-frequency time segment of using the dishwasher per unit of time, and generate a control signal for controlling an operation state of a drying module; and the drying module, connected to the controller to receive the control signal for controlling operation of the drying module, wherein the controller is configured to control the drying module to operate in the low-frequency time segment and to be in a non-operation state in the high-frequency time segment.