A non-transitory computer-readable medium storing computer-readable instructions, the instructions, when executed by a processor of a communication device, performing processes comprising:
- a first receiving operation receiving, from an another communication device via a network, specific position information indicating a specific position in a display area on a display of the communication device;
- a first determination operation determining whether block position information corresponding to the specific position indicated by the received specific position information is included in first block information stored in a storage device, the block position information indicating a position at which one of a plurality of block images is arranged, the plurality of block images being included in a display image of one page displayed on the display, the first block information being information in which a plurality of pieces of page information are associated with a plurality of pieces of block position information, each of the plurality of pieces of page information respectively identifying each of a plurality of display images corresponding to a plurality of pages, and each of the plurality of pieces of block position information indicating positions of the plurality of block images included in each of the display images for the plurality of the pages;
- a setting operation setting a magnification factor of a target block image in response to determining that the block position information corresponding to the specific position is included in the first block information, the target block image being a block image among the plurality of block images, the target block image being arranged at a position indicated by the block position information corresponding to the specific position, the magnification factor being one of a first factor and a second factor, the first factor corresponding to a ratio of a length of the display area in the first direction to a length of the target block image in a first direction, the second factor corresponding to a ratio of a length of the display area in the second direction to a length of the target block image in a second direction, and the second direction being a direction perpendicular to the first direction;
- a processing operation processing the target block image based on the set magnification factor;
- and
- a display operation displaying the processed target block image on the display.