A method, a communication device and a computer program product for displaying caller information are provided. In the present method, when the communication device is in a communication mode, a user interface of the communication mode is displayed, wherein the user interface comprises at least one on-screen button having caller information displaying function. Then, a selecting operation performed on one of the on-screen buttons by a user of the communication device is received, the caller information associated with a caller is retrieved according to the selected on-screen button, and the retrieved caller information is displayed. Thereby, in the present application, the user of the communication device can obtain information about the caller at the same time when the user is communicating with the caller, and accordingly communication is made more convenient.