Abstract: An image-sharing server of an image-sharing system acquires candidate storage data including an update image currently displayed on an image-providing terminal. When, for instance, a predetermined reception band of a second image-receiving terminal is narrower than an optimum transmission band of the image-providing terminal, the image-sharing server specifies the last update data in an order for the update data to be stored in a second transmission buffer as comparison data. Further, when determining that an update region of the comparison data is included in an update region of the candidate storage data, the image-sharing server deletes the comparison data and stores the candidate storage data in the second transmission buffer. Subsequently, the image-sharing server transmits the update data of the second transmission buffer to a second receiving terminal in the order for the update data to be stored to update the image currently displayed on the second image-receiving terminal to update data.

Abstract: The control device (110) executes the application recorded in the memory device (140) in a personal computer. When text insert mode is selected during the execution of the application, the text input box (200) is set on the application image depending on the user's operation. The application control part (111) of the control device (110) determines text size which is the largest in the area where text height is below the upper limit value from multiple predetermined candidate values of text size as the text size (SZ) suitable for displaying texts. When texts are entered, the application control part (111) controls the display data produce part (113) and the display control part (112) to display texts (TXT) at the determined text size (SZ).