Data display device, data display method, and program product

A method, comprising:

• displaying upon a display device at least one tree structure in which the plurality of pieces of data serve as nodes;
• identifying, in response to a first node being selected from among the nodes constituting the displayed tree structure, all nodes connected to the first node in a high-order direction and a low-order direction as a first node group;
• identifying, in response to a second node being selected, the second node not being included in the first node group, all nodes connected to the second node in the high-order direction and the low-order direction as a second node group;
• accepting an operation of moving the second node toward the first node and moving the second node group toward the first node in accordance with the operation;
• determining, using a processor and in accordance with a predetermined rule, a node whose display is to be omitted in accordance with movement of the second node group;
• and
• instructing the display device to display the first node group and the second node group close to each other by omitting display of the determined node.

A computer program product for displaying a plurality of pieces of data by using a tree structure, the computer program product comprising a computer readable storage medium having program code stored thereon, the program code executable by a processor to perform a method comprising:

• displaying upon a display device at least one tree structure in which the plurality of pieces of data serve as nodes;
• identifying, using the processor and in response to a first node being selected from among the nodes constituting the displayed tree structure, all nodes connected to the first node in a high-order direction and a low-order direction as a first node group;
• identifying, using the processor and in response to a second node being selected, the second node not being included in the first node group, all nodes connected to the second node in the high-order direction and the low-order direction as a second node group;
• accepting, using the processor, an operation of moving the second node toward the first node and moving the second node group toward the first node in accordance with the operation;
• determining, using the processor and in accordance with a predetermined rule, a node whose display is to be omitted in accordance with movement of the second node group;
• and
• instructing, using the processor, the display device to display the first node group and the second node group close to each other by omitting display of the determined node.