To provide an application platform device, an application platform system and an operation method of the application platform device in which a plurality of existing servers can be utilized by making the servers independently operate, with easy work.

In an application platform device 2, following steps are performed: a function allocation part 242 determines servers 3 to which each function of a plurality of applications included in workflow information is allocated, on the basis of the workflow information stored in a workflow DB 232 and allocates the functions to the servers; a parameter generation part 243 generates a parameter showing a physical processing flow of the servers 3 to which the functions are allocated; and a parameter transmission part 244 transmits the parameter generated by the parameter generation part 243 to a server 3 which is an origin of processing among the servers 3 to which the functions are allocated.