Map information transmission device for transmitting objects for display superimposed on map, map display device, and method

A map display device that communicates with a map information transmission device via a network, comprising:

• a display;
• and
• one or more processors configured to perform:
• transmitting, via the network, information indicating a position in a map to the map information transmission device;
• receiving, from the map information transmission device, a single merged image and display code including clipping information and superimpose destination information for a sub region in the map, wherein the sub region corresponds to the position in the map transmitted to the map information transmission device, the single merged image includes a plurality of objects to be superimposed on the sub region, the clipping information designates first areas on the single merged image for the sub region, each of the first areas corresponding to each of the objects included in the single merged image for the sub region, and the superimpose destination information for the sub region designates second areas on the map, onto which each of the first areas corresponding to each object included in the single merged image for the sub region is to be superimposed;
• clipping each of the first areas corresponding to each of the objects included in the single merged image for the sub region based on the clipping information;
• and
• displaying, on the display, each of the first areas corresponding to each of the objects clipped from the single merged image in a superimposed manner on the map based on the superimpose destination information,
• wherein the first areas and the second areas are different.

A method performed by a map server connected to a network for transmitting an object to be displayed superimposed on a map, the method comprising:

• dividing a region of the map into a plurality of sub regions based on superimposition positions at which a plurality of objects are to be displayed superimposed on the map, the dividing being performed such that a number of objects included in each of the plurality of sub regions is a predetermined number or lower;
• generating, for each of the plurality of sub regions, a single merged image for a sub region, wherein the single merged image for a first sub region of the plurality of sub regions includes objects to be superimposed on the first sub region;
• generating, for each of the plurality of sub regions included in the single merged image for the first sub region, display code that includes clipping information and superimpose destination information, wherein the clipping information of the display code for the first sub region designates first areas on the single merged image for the first sub region, each of the first areas corresponding to each of the objects included in the single merged image for the first sub region, and wherein the superimpose destination information of the display code for the first sub region designates second areas on the map, onto which each of the first areas corresponding to each object included in the single merged image for the first sub region is to be superimposed;
• and
• transmitting, via the network, the single merged image and the display code for the first sub region to a map display device in response to receiving a position in the first sub region from the map display device,
• wherein the first areas and the second areas are different.