PROBLEM TO BE SOLVED: To provide a multiplexing apparatus that can reduce a delay time with respect to data transmission in an ATM network. SOLUTION: The multiplexing apparatus 103 is provided with a route selection section 404 that receives data sent from a data communication unit 101 and to be sent in the ATM network, a cell assembling section 407 that assembles cells from the received data, and a clock generating section 409 that generates an internal timing signal 412 corresponding to a multiple of n (n is a natural number) of a communication speed used for the transmission of the received information and an external timing signal 413 corresponding to the communication speed, and the cell assembly section 407 samples data to be transmitted on the basis of the internal timing signal 412 and uses the sampled data to assemble cells.
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