PURPOSE: To provide a control method of a parallel multiple electronic interlocking device that can start a system and quickly return to parallel operation without using a special device or without synchronizing different systems.

CONSTITUTION: A parallel multiple electronic interlocking device is provided A with at least one pair of child locals 20, 30 that are provided as an electronic interlocking device, a primary system, to which one parts 22, 32 of the pair of child locals 20, 30 are connected in parallel to one another, a secondary system 36, to which the other parts, 24, 34 of the pair of child locals 20, 30 are connected in parallel to one another, and a parent local 10, to which the primary system 26 and the secondary system 36 are connected in parallel with one another, respectively. The pair of child locals 20, 30 are operated in parallel to one another, while the primary system 26 and the secondary system 36 execute parallel processing in this multiple electronic interlocking device 40, in which the processed data of the parent local 10 and those of the child locals 20, 30 are transmitted by the parent local 10 to the child locals 22, 24, 32, and 34.