Patent ID: 8838835

Claim:
A session terminal apparatus constituting a network session system together with a second session terminal apparatus for communicably connecting through a communication network, the session terminal apparatus comprising: performance reproduction circuitry for reproducing performance information; a communication interface for communicating with said second session terminal apparatus; a back performance instruction part for instructing reproduction of back performance information; a back performance control part for transmitting the back performance information, when the reproduction thereof is instructed by the back performance instruction part, to said second session terminal apparatus through the communication interface, and for controlling the performance reproduction circuitry to start reproducing the back performance information when a monitor delay time corresponding to a communication delay time between the session terminal apparatus and said second session terminal apparatus has elapsed after the reproduction of the back performance information was instructed; a user performance input part for inputting user performance information based on performance which is performed by a user along with the reproduction of the back performance information; and a user performance control part for transmitting the user performance information inputted through the user performance input part to said second session terminal apparatus through the communication interface, and for controlling the performance reproduction circuitry to reproduce the user performance information.