1. An information processing terminal having a relay function of making a client which manages data and a service which provides a function using the data managed by the client cooperate with each other via a network, the information processing terminal comprising: a registration unit configured to perform registration processing for registering function information for calling the function provided by the service, with the relay function; an identification unit configured to, if instructed by a user to call a function for specific data managed by the client, identify second function information from the function information registered by the registration unit, the second function information for calling a second function being intended to adapt the specific data to a processable type of first function information registered by the registration unit, the first function information belonging to a category corresponding to the function called by a user's instruction; a request unit configured to issue a request for processing the specific data processed with the second function called by using the identified second function information, with a first function called by using the first function information; and a reception unit configured to receive a result of the processing requested by the request unit.