A computer readable medium storing a program causing a computer to execute information processing, the processing comprising:
- acquiring first display content information indicating display content being displayed at a display section of a device used by a user, and user information indicating the user that has displayed the display content at the display section;
- generating difference information, when second display content information corresponding to the acquired user information is stored in a storage section, the difference information indicating a difference between the stored second display content information and the first display content information being displayed at the display section;
- and
- transmitting a display instruction to display the difference information at the display section of the device.