A wearable device, comprising: a microprocessor control unit, a first switch module, a Bluetooth module, and a multimedia module, wherein the Bluetooth module, the multimedia module, and the microprocessor control unit are all connected to the first switch module; the Bluetooth module is configured to send a switch request to the first switch module according to a received scenario notification, wherein the Bluetooth module is configured to receive the scenario notification sent by a terminal device or sent by another module in the wearable device, wherein the scenario notification is a multimedia module viewing request sent by a terminal device; or the scenario notification is a microprocessor-control-unit data synchronization request sent by a terminal device; or the scenario notification is a preset-event occurrence notification sent by the microprocessor control unit; the first switch module is configured to establish a data transmission connection between the Bluetooth module and the multimedia module, or establish a data transmission connection between the Bluetooth module and the microprocessor control unit, according to the switch request; and the multimedia module is configured to store and play a multimedia file, and the microprocessor control unit is configured to monitor and store data corresponding to a preset event; wherein a first general purpose input/output, GPIO connection is further established between the Bluetooth module and the first switch module, and the Bluetooth module is configured to send the switch request to the first switch module by using the first GPIO connection;wherein when the scenario notification is a multimedia module viewing request sent by a terminal device, and the switch request is a first switch request: the Bluetooth module is specifically configured to: receive the multimedia module viewing request sent by the terminal device, and send the first switch request to the first switch module according to the multimedia module viewing request; and the first switch module is configured to establish the data transmission connection between the Bluetooth module and the multimedia module according to the first switch request; and wherein when the scenario notification is a microprocessor-control-unit data synchronization request sent by a terminal device, and the switch request is a second switch request; the Bluetooth module is specifically configured to: receive the microprocessor-control-unit data synchronization request sent by the terminal device, and send the second switch request to the first switch module according to the microprocessor-control-unit data synchronization request; and the first switch module is configured to establish the data transmission connection between the Bluetooth module and the microprocessor control unit according to the second switch request and wherein when the scenario notification is a preset-event occurrence notification sent by the microprocessor control unit, and the switch request is a third switch request; a second GPIO connection is established between the Bluetooth module and the microprocessor control unit; the microprocessor control unit is configured to send the preset-event occurrence notification to the Bluetooth module by using the second GPIO connection when detecting that a preset event occurs; the Bluetooth module is specifically configured to: receive the preset-event occurrence notification sent by the microprocessor control unit, and send the third switch request to the first switch module according to the preset-event occurrence notification; and the first switch module is configured to establish the data transmission connection between the Bluetooth module and the microprocessor control unit according to the third switch request. the Bluetooth module is specifically configured to: receive the multimedia module viewing request sent by the terminal device, and send the first switch request to the first switch module according to the multimedia module viewing request; and the first switch module is configured to establish the data transmission connection between the Bluetooth module and the multimedia module according to the first switch request; the Bluetooth module is specifically configured to: receive the microprocessor-control-unit data synchronization request sent by the terminal device, and send the second switch request to the first switch module according to the microprocessor-control-unit data synchronization request; and the first switch module is configured to establish the data transmission connection between the Bluetooth module and the microprocessor control unit according to the second switch request a second GPIO connection is established between the Bluetooth module and the microprocessor control unit; the microprocessor control unit is configured to send the preset-event occurrence notification to the Bluetooth module by using the second GPIO connection when detecting that a preset event occurs; the Bluetooth module is specifically configured to: receive the preset-event occurrence notification sent by the microprocessor control unit, and send the third switch request to the first switch module according to the preset-event occurrence notification; and the first switch module is configured to establish the data transmission connection between the Bluetooth module and the microprocessor control unit according to the third switch request.