1. An information processing apparatus for project management comprising: a function of displaying, on a screen, a task area used to display symbols, wherein the symbols represent a document relating to at least one task constituting a project and task, respectively; and a function of performing document work according to an operation instruction for the symbol representing the document displayed in the task area; wherein the task area has a work area where a symbol representing a document of a task and a symbol representing task other than output work are displayed, and an output area; and wherein the output area displays, in the output area of the task area on the screen, a symbol representing a document in a task area of another associated task constituting the project when the symbol representing the document is moved within the output area.