Display control method and display control apparatus

A method of controlling a computer with a screen, the method comprising:

• displaying, on the screen, a tab display area and a content display area, wherein the tab display area displays one or more tabs in a tree view, wherein the one or more tabs are associated with one or more content items, and wherein the content display area displays any of the one or more content items;
• displaying in the content display area, in response to a display target tab being selected from the one or more tabs, a display target content item associated with the display target tab;
• updating, in response to an addition request to add an additional content item, the tab display area to display an additional tab associated with the additional content item, wherein the updating displays the additional tab as a child node of the display target tab in the tree view, wherein the displaying the tab display area arranges a parent tab that is a tab associated with a content item corresponding to a parent node of the display target content item associated with the display target tab, the display target tab, and a child tab that is a tab associated with a content item corresponding to a child node of the display target content item associated with the display target tab in a first direction in the tree structure and arranges the display target tab and a sibling tab that is a tab associated with a content item sharing the parent node with the display target content item associated with the display target tab in a second direction substantially perpendicular to the first direction in the tree structure;
• editing a tree structure of the tree view by moving a movement target tab and one or more tabs corresponding to one or more descendant nodes of the movement target tab in the tree structure;
• and
• storing, in a memory, a content list associating a node identification value, a node parent identification value, and a node child identification value for each of the one or more content items, wherein the node identification value directly identifies the parent-descendant relationship for a node corresponding to the content item of the node identification value.

A display control apparatus that is able to control a screen, the display control apparatus comprising:

• a processor configured with instructions to,
• display, on the screen, a tab display area and a content display area, wherein the tab display area displays one or more tabs in a tree view, wherein the one or more tabs are associated with one or more content items, and wherein the content display area displays any of the one or more content items,
• display in the content display area, in response to a display target tab being selected from the one or more tabs, a display target content item associated with the display target tab,
• update, in response to an addition request to add an additional content item, the tab display area to display an additional tab associated with the additional content item, wherein the updating displays the additional tab as a child node of the display target tab in the tree view, wherein the displaying the tab display area arranges a parent tab that is a tab associated with a content item corresponding to a parent node of the display target content item associated with the display target tab, the display target tab, and a child tab that is a tab associated with a content item corresponding to a child node of the display target content item associated with the display target tab in a first direction in the tree structure and arranges the display target tab and a sibling tab that is a tab associated with a content item sharing the parent node with the display target content item associated with the display target tab in a second direction substantially perpendicular to the first direction in the tree structure,
• edit a tree structure of the tree view by moving a movement target tab and one or more tabs corresponding to one or more descendant nodes of the movement target tab in the tree structure, and
• store, in a memory, a content list associating a node identification value, a node parent identification value, and a node child identification value for each of the one or more content items, wherein the node identification value directly identifies the parent-descendant relationship for a node corresponding to the content item of the node identification value.