Caller information display system and recording medium

1. Field of the Invention A caller information display system and recording medium in a communication system in which voice communication and data communication can be done between multiple terminals over a network following an Internet protocol, includes a caller information storage unit in which caller information of each local terminal is stored in advance in each terminal, and an input unit that inputs caller information. A display unit displays caller information, and a call circuit unit controls voice communication. The display system also has a caller information transmission and reception control unit which controls transmission and reception of caller information when a call is made or received. When a call is made or received by voice communication with another terminal, caller information is mutually transferred between the calling terminal and the called terminal, and information on the other caller is displayed on the display unit of both the caller terminal and the call recipient terminal simultaneously with the callout or incoming call display.