A task item can be stored in a collaboration database, wherein the collaboration database able to be accessed by a communication module and a task management tool, which both run on a client. The communication module can be able to access a communication server that provides a communication service to the client. The task management tool can be able to access a collaboration server that provides a collaboration service to the client. A collaboration item can be established that contains a task identifier associating with the task item and a collaboration identifier associating with contact information. The communication module running in a client can be called according to the contact information of the collaboration database. The task item can be displayed within a user interface of a communication application via the communication module.