COMPUTING DEVICE AND DATA TRANSMISSION METHOD

A computing device includes a high-security OS application, a low-security OS communication application, and a user interface application. The high-security OS application runs on a high-security operating system. The low-security OS communication application and the user interface application run on a low-security operating system whose security level is lower than the high-security operating system. A data communication between the high-security OS application and the low-security OS communication application is performed by an in-chip applications communication or a wired communication. Data transmitted from the high-security OS application to the low-security OS communication application is encrypted. The low-security OS communication application is configured to decrypt the encrypted data and control, based on the decrypted data, contents displayed on a display. The user interface application configured to display, on the display, contents determined based on data input from an application that runs on the low-security operating system.